Tag: Italy

Estimating Tax Evasion in Europe: Direct vs. Indirect Survey Methods

Posted on November 10, 2025 | Policy Brief

Stack of €50 euro banknotes in partial shadow, symbolizing hidden cash and tax evasion survey methods.

How can societies accurately gauge the share of the workforce engaged in the shadow economy when direct questions inspire selective silence or evasion? This policy brief presents findings from a new cross-country survey experiment combining direct questions and an indirect “list experiment” method, conducted in Latvia, Italy, and Denmark. Results show that, contrary to expectations, indirect methods did not yield higher estimates of undeclared work compared to direct questions. The research reveals that in environments with high tax morale and a substantial shadow economy, both direct and indirect measurements can be biased. Sharing information about prevailing tax norms with respondents can improve survey consistency, informing future tax evasion measurement and anti-evasion policymaking.

Social Desirability Bias in Tax Evasion Surveys

Surveys on tax evasion often provide respondents with multiple response categories beyond simple “yes” or “no.” For example, the survey for Latvia (Kantar, 2024) found that 3% openly acknowledged undeclared income, but refusal (2%) and “hard to say” responses (4%) illustrate additional uncertainty and possible underreporting due to social desirability bias when respondents consciously avoid disclosing disapproved or illegal acts to maintain a positive self-image or avoid perceived censure. This bias is potentially serious in tax compliance research, where both tax morale and fear of consequences can shape reporting behavior.

Indirect questioning techniques, such as list experiments, aim to reduce social desirability bias by allowing individuals to conceal answers within a broader set of innocuous items (Blair et al., 2020). In a typical list experiment, respondents are randomly assigned to receive either a list of non-sensitive items or the same list with an additional sensitive item; by comparing the mean number of items endorsed across groups, researchers estimate the prevalence of the sensitive behavior without requiring explicit disclosure (Blair & Imai, 2012; Glynn, 2013).

Recent empirical work employing list experimental designs has significantly advanced the understanding of tax evasion dynamics across diverse fiscal and cultural contexts. Fergusson, Molina, and Riaño (2019) analyzed VAT evasion among Colombian consumers and found minimal social desirability bias, with list experiments and direct self-reports yielding similar evasion rates (~20%). They attributed this to the normalization of evasion in high-informality regions, where descriptive norms (perceived prevalence of evasion) outweighed injunctive norms, reducing stigma.

This contrasts with Genest-Grégoire et al. (2022), who detected significant bias in Canadian income tax self-reports: list experiments revealed 13.5% income tax evasion (compared to 5.6% in direct questions) and 28.5% consumption tax evasion (compared to 26.2% in direct questions). The study identified stronger stigma around income tax evasion, particularly due to institutional withholding mechanisms that make income tax evasion more difficult compared to consumption taxes. Authors posit that divergent motivational mechanisms underlie these evasion types: income tax noncompliance triggers stronger moral condemnation due to its association with deliberate fraud, while consumption tax evasion is often rationalized as a “victimless” violation of complex regulations.

Hence, high tax morale, while generally associated with greater compliance, also leads individuals to conceal or misrepresent socially undesirable actions more rigorously, which amplifies social desirability bias in survey responses. This effect is particularly pronounced in environments where tax evasion is strongly stigmatized, as respondents may feel increased pressure to align their self-reports with prevailing moral standards, even if those reports do not reflect their true behavior. Conversely, in contexts where evasion is normalized or perceived as widespread, the stigma associated with noncompliance decreases, potentially making individuals less reluctant to report such behavior.  Nevertheless, both direct and indirect measurement techniques may still fail to accurately capture the true prevalence. This is because reduced stigma alone does not eliminate other sources of bias, including cognitive complexity, survey design imperfections, and strategic respondent behavior, such as misinterpreting instructions or using responses to send political or social signals beyond truthful self-disclosure.

Recognizing these persistent methodological challenges, this policy brief presents evidence from a study employing both direct and indirect questions on tax evasion across three European countries with varying levels of tax morale and shadow economy prevalence. By analyzing how social contexts influence reporting behaviors, the brief provides insights into the effectiveness and limitations of these survey approaches in different normative environments.

Approach

The research used a nationally representative sample of 6,915 respondents from Latvia, Italy, and Denmark, utilizing Norstat online panels in the respective countries. It was administered as an online Computer Assisted Web Interview (CAWI) in May 2024. Respondents in the study were randomly assigned to one of two list experiment conditions: half received a 5-item list including the sensitive tax evasion item, while the other half received a 4-item list without the sensitive item (see Figure 1). Importantly, all respondents—regardless of their list group assignment—were asked a direct question about undeclared income at the end of the survey. This design allows comparison between indirect and direct measures within the same individuals, clarifying reporting patterns and social desirability effects.

Figure 1. Indirect question for the control group of the list experimental study

Notes: The 5-item list for the treatment group included additional activity “Received all or part of the income without paying taxes (received money “off the books”)” and asked to indicate max 5 items. The activities were listed in random order for each respondent.

All participants also completed a placebo list experiment, in which both lists – i.e., containing 4 or 5 items – consisted entirely of non-sensitive behaviors (see Figure 2). Correspondingly, everyone was also asked a direct question about the non-sensitive behavior (“Bought a house or apartment (including on credit)”), thereby mimicking the structure of the tax evasion list experiment. This design allowed controlling for possible cognitive errors in filling out a complicated survey task, such as a list survey question, that are unrelated to social desirability bias.

In addition, half of all respondents were primed to information with actual data on how many citizens in their country consider tax evasion unacceptable, sourced from a recent representative survey that was carried out in January 2024. In this pre-survey, just 39% (i.e., minority) found tax evasion wholly unacceptable in Latvia; 59% in Italy, and 53% in Denmark (i.e., majority). The goal of this priming was to test whether informing respondents about local norms affected reporting patterns.

Figure 2. Placebo list of the study

Notes: The 5-item list for the treatment group included additional activity “Bought a house or apartment (including on credit)” and asked to indicate max 5 items. The activities were listed in random order for each respondent.

Key Findings

Results show that indirect list experiment estimates of undeclared work (4.1% overall) did not significantly differ from direct question estimates (7.2%). Hence, respondents did not find the topic sensitive enough to avoid honest answers in either format.

Priming respondents with information about the unacceptability of tax evasion in their country had no statistically significant effect on the direct measure of admitted undeclared income, nor on aggregate estimates from the indirect list experiment, indicating that willingness to disclose undeclared work remained unchanged regardless of norm priming.

Figure 3. Estimates of tax evasion from the list experiment and direct question

Source: Author’s estimate from the survey results.

However, country-level analysis revealed an anomaly in Italy: the list experiment produced an implausible negative estimate, driven by some respondents who marked zero items in the treatment list but later admitted to undeclared work in direct questioning. While this inconsistent response pattern was most prominent in Italy, the country with the highest tax morale (as based on pre-survey), and the largest shadow economy across the three countries (Medina and Schneider, 2018), it has also been recorded in the other two countries. Specifically, the pattern was observed among 11% of respondents who admitted to tax evasion in the direct question in Italy, compared to 5–7% in Latvia and Denmark.

Considering the complexity and unusual formulation of the question for the list experiment, one might attribute this pattern to a respondent’s confusion or cognitive error. However, this explanation is unlikely because of the responses to the placebo list experiment, where all list items and a direct question are non-sensitive. There, the specific response pattern – respondents reporting zero items on the list question while simultaneously admitting to the direct question – is observed substantially less frequently, indicating a low baseline error rate for misunderstanding or inconsistent reporting on non-sensitive items.

The comparison between the sensitive and placebo list experiment results indicates that the anomalous pattern observed in the tax evasion list experiment is unlikely to be due to confusion with the survey format, but rather represents a deliberate, context-specific form of strategic misreporting. One possible reason for this pattern might be that some Italians who admit to tax evasion in the direct question may believe that inflating shadow economy estimates will spur stronger policy reactions or public debate. In this way, their answers to the survey may represent strategic “signal sending.”

Priming respondents with accurate information about societal norms regarding the unacceptability of tax evasion – an approach referred to as vignette priming – consistently reduced the occurrence of this contradictory response pattern. Fewer respondents reported zero items in the list experiment while admitting to evasion in direct questioning, a change observed universally across the three countries.

Two main interpretations of the effects of such vignette priming can be suggested. The first interpretation, related to the strategic motive discussed above, suggests that vignette priming helps align respondents’ understanding of prevailing social norms on tax evasion. This improved awareness discourages deliberate misreporting, thus improving the overall validity and reliability of the survey’s methodology, even if it does not increase overall admissions of tax evasion itself. An alternative explanation is that vignette priming helps respondents better recognize and correctly count items in the list experiment, thereby improving response accuracy and alignment across question formats.

In other words, norm priming fosters more consistent survey responses, whether by reducing the temptation to manipulate results or by increasing recognition and attention among respondents.

Conclusion

Efforts to estimate tax evasion through surveys must strike a balance between the limitations of direct self-reports and the incomplete protection against bias afforded by indirect methods. This study finds that, in the surveyed countries, list experiments do not yield higher or more accurate prevalence estimates than direct questioning. However, particularly in high-morale environments with substantial shadow economies, some respondents may strategically manipulate survey results in hopes of prompting political action.

Norm priming through vignettes enhances experimental integrity and reduces strategic errors, underscoring the importance of accounting for social context in survey designs. For tax policy makers, measurement should always be validated with error diagnostics and social context cues, and survey formats should be adapted for cross-country comparability and public trust.

Acknowledgements

The study is financed by the European Commission’s Marie Sklodowska-Curie Individual Fellowship Action (Grant agreement ID: 101109679).

References

Disclaimer: Opinions expressed in policy briefs and other publications are those of the authors; they do not necessarily reflect those of the FREE Network and its research institutes.

Buyer Heterogeneity in Public Procurement

Posted on November 9, 2015 | Policy Brief

Authors: Elena Paltseva and Giancarlo Spagnolo, SITE.

We show that different types of contracting authorities exhibit rather different behavior in public procurement. In particular, in Sweden strategic bunching below the EU threshold is only observed for a certain type of authorities. The identity of the strategically behaving group is also non-uniform across different types of procurement contracts or geographic localities. Similarly, in Italy’s public works procurement only a specific type of public buyer seems related to bunching below the threshold. This suggests that the type of public buyer, and associated differences in incentives and outcomes, should be taken into consideration in designing procurement regulation and more general policy-making.

Natural Resources, Intangible Capital and Sustainable Development in a Small, Oil-Rich Region

Posted on December 3, 2012 | Policy Brief

20121203 Natural Resources, Intangible Capital and Sustainable Development Image 01

“Where scientific enquiry is stunted, the intellectual life of a nation dries up, which means the withering of many possibilities of future development.” – Albert Einstein, 1934 The rampant unemployment rates and the general contraction of economic activity in many western countries rekindled the fear of emigration and brain drain, which for a while seemed to be exclusively a developing-world problem. This brief illustrates a potential new approach to the issue, through a recent experience in a small but oil-rich region of Southern Italy. 

Economic Growth and Brain Drain

Since the times of Solow, economic theory represents growth as the result of a process not unlike some sort of portfolio management. Just like any individual investor, countries own and need to manage certain assets, characterized by different properties and returns: some are exhaustible, others are renewable or living, and ensure a sustained stream of income.  In the original formulations, the economy’s productive assets were identified in land, capital and labor, to which human capital was soon added. In 2006, the World Bank published estimates of 120 countries’ total wealth, in an attempt to introduce a broader view of what these assets really are [1]. The report classified a country’s capital into three main types: natural, produced (physical) and intangible. A striking pattern emerged. While the share of produced assets in total wealth is virtually constant across income groups of countries, the share of natural capital tends to fall with income, and the share of intangible capital rises. This means that rich countries are largely rich because of the skills of their populations and the quality of the institutions supporting economic activity.

There is an important relation between the different types of assets. In order to avoid illusory and temporary growth based on consuming the readily available natural capital, efficient management through saving and investment can transform one type of asset into another, achieving sustainability over time. Although this may sound as no big news, the analysis of the actual savings and rates of growth in the different form of capital reveals far from ideal situations all over the world. In many resource-rich developing countries, savings rates have been negative for many decades, meaning that resource rents have been at best used for consumption. In the worst cases, they have fueled corruption and private enrichment of small elites, as highlighted by the extensive literature on the “resource curse”.

Also, renewable natural resources are often exploited in an unsustainable fashion. One case in point is the thorny issue of fish stocks, but many more examples are discussed in the literature on ecosystem services. Even the intangible capital is under stress in many places. In the wording of the 2006 World Bank report, “intangible assets include the skills and know-how embodied in the labor force; social capital, that is, the trust among people in a society and their ability to work together for a common purpose; all those governance elements that boost the productivity of labor: an efficient judicial system, clear property rights, and an effective government.” Probably the first component in the list, what is traditionally indicated with the term human capital, is the most tangible, observable and relatively controllable part of it.

Controlling the Brain Drain?

Although there are many arguments in favor of international careers and general workforce mobility,[2] some regions experienced negative and prolonged net outflows – emigrants minus immigrants – to the extent that they now face a real risk of hold ups in their economic development. This, due to shortages of vitally needed high-skilled personnel. Even the economic sustainability of many basic services and businesses is in doubt due to the shrinking customer base.

Southern Italy is one of these regions. The net outflow of people with a bachelor or higher degree is negative[3] even at the national level,   -2% over the latest ten years. In southern Italy, with a population of just above 13 million, the net balance of emigrants and immigrants over the same period amounts to -630,000. 70% of these people are aged between 15 and 34, and 25% hold at least a bachelor degree. To this figure, which is based on changes in official residence and therefore grossly underestimates the real size of the phenomenon, must be added the 150,000 that on average every year join the flow of internal migrants or long-distance commuters from the south to Northern Italy. Among these people, 47% are aged between 15 and 34, and almost 30% hold a bachelor or higher degree. The reason for these massive outflows can be identified in the labor market dynamics. If we break down the average 22% decline in job creation for youth between 2008 and 2011, new hires declined by 30% for youth with a bachelor degree and 14% for higher degrees, against 11% decline for youth with only secondary education.[4]

As opposed to physical capital, recent research shows that loss of human capital can have long lasting crippling consequences for economic growth (Waldinger, 2012). Among the policies that have been tried in order to stop or counterbalance the brain drain, a first set targets human capital as embodied in the workforce, i.e. tries to attract highly trained people. Probably the most popular are economic incentives in the form of tax rebates, higher wages or other job-related benefits and amenities. This kind of incentive regime exists in Italy since December 2010, though only targeting Italian nationals. However, for many high-skilled professionals, the important factors are others, such as a generally innovative and creative environment, a network with a critical mass, a transparent and competitive labor market not contaminated by politics, high quality support services, and other conditions that are not as easy and cheap to modify. Some countries have played the card of instead attracting prestigious foreign schools to their national territory to prevent their brilliant youth from leaving in the first place. Many famous western universities have already initiated partnerships with or lent their names to schools and universities in these countries and even built replicas of themselves – mostly in Asia – so as to get a toehold in the world’s largest education market, or in the Gulf States, where financial resources abound. There are successful examples of such partnerships in Italy, too.

A different approach has been taken by the new government, with the realization that the country can benefit from the pool of expatriated talents without moving them permanently back. A program of facilitation for visiting scholars and exchange students was thus launched in September 2012. But a step even further is actually possible. A network of scholars and high-skilled professionals that want to contribute to the development of a particular country or region, for example their place of origin, does not require physical presence on the territory, and not even any formal or institutional bond. The only needed ingredient is the Internet. Not removed from the environment and the conditions where they achieved success, these people can actually contribute even more. This is the idea behind, for example, Innovitalia.net and other smaller independent initiatives inspired by the concept of crowd-sourcing.[5]

The Experience of Basilicata

I recently witnessed (what I hope is) the birth of one such network in the region where I am from. Basilicata, also known as Lucania, is a small, poor region of less than 600,000 inhabitants scattered across 131 different municipalities on a territory of barely 10,000 squared kilometers, between the heel and the toe of the boot that the Italian peninsula resembles. Here, the crisis hit especially hard and migration outflows are since then even stronger, especially among youths.  According to SVIMEZ (a think tank focused on entrepreneurship and economic activity in Southern Italy), Basilicata has lost 10% of its regional GDP since 2007, much more than the national average of -4.6%. Compared to other large European economies, Spain is currently at -2.7, while Germany and France, notwithstanding the low annual growth rates, are now back at the same level as in 2007. The youth employment rate (with the generous definition of 15-34) is alarmingly low at 30%, down by 15% since 2007, and only 24% for women. As a result, the consumption level of 27.5% of families is now below the poverty threshold, compared with 11% of families at the country level.[6]

Enter Europe’s largest onshore oil and gas reservoir; about 150,000 oil barrels are extracted in Basilicata every day, covering 12% of the national oil demand. The exploitation started in the late 1990s, although the reservoir has been known since at least the 1970s. It is expected that these oil fields will be operational until 2022, but at least one more reservoir with about the same estimated capacity remains unexploited. The regional government has for the time being blocked any new concession, hoping perhaps to negotiate better conditions. The truth is, there have been strong concerns – related to lack of transparency and in some cases to alleged corruption – voiced at the actual quantities of extracted oil and what is a fair distribution of revenues. After more than 10 years, it is hard to claim any major social impact of the project:  there is a clear lack of funds to invest in local small and medium size businesses and, as observed above, unemployment in the area remains a problem while the regional population has plummeted.

Is this a case of “resource curse”? Not really. There is no clear evidence of corruption, or elite capture – the problem seems to be mostly poor management and a lack of ideas, mixed with the deeply rooted penchant of local politics for populism and the clientela system (patronage). To give an idea, creativity in using the oil money did not go much beyond the restoration of many of the small town’s pavements and facades. In 2009, in line with the so called “Development Action Plan” of the Berlusconi government, an 80 euro lump sum was distributed to all residents. After the crisis hit harder, the royalties have also been used to cover holes here and there in the current account. Data from the Ministry for Economic Development shows that capital investment in the region went down by 8.5% per year between 2008 and 2011, while current expenditure went up by 3%. Going back to the importance from the growth perspective of savings and investment versus consumption, it is worth remarking that current expenditure is (in most part) consumption.

Can this bounty instead become an answer to Basilicata’s troubles? This was the question driving the first Sustainable Development School, held at the end of October in Viggiano, a small town in the center of the oil field, hosting 23 oil wells. Sponsored by a number of institutions and associations, local or national,[7] the event attracted a group of 45 economists, sociologists, managers and entrepreneurs, engineers and culture sector specialists, in most part born in Basilicata and working or studying abroad. Seven of these participants were instead citizens of various countries in the Middle East and North Africa region, working or studying in Basilicata. This heterogeneous group worked together for two days on concrete proposals to be put on the administrator’s tables, in five main areas: Regional Economy in the new Euro-Mediterranean context, Energy and natural resources, Environmental protection, Infrastructure for environmental protection, Promotion of the historical, cultural and social heritage. Given the context, most projects focused on alternative proposals for how to use the royalties. The keyword was, however, sustainability. Everybody was well aware of the fact that for them to last longer than oil itself, these resources must be saved and earmarked to some productive use that, leveraging on other locally abundant resources, can start off a process of self-sustained development. The projects highlighted the stimulation of local small-scale entrepreneurship and the creation of employment opportunities as necessary ingredients for a fairer sharing of the revenues but most importantly for long-term sustainability.

Many local resources, not fully utilized at present, were brought in as examples: the abundant wood, the underexploited waterways, even the wastewater from bigger agricultural and animal farms, connected to the potential for small-scale generation of energy from renewable sources. On a slightly different note, the list continued with the historical and cultural heritage, natural beauty and the religious and culinary traditions that could support a much more developed tourism industry than what it does today. All of this, in the proposals of the participants, has the potential to support profitable businesses that bring employment to the community. This ingredient is considered crucial, in the perspective that the long-term survival of any (business) initiative requires tying its success to the welfare of the local communities. The focus was thus overwhelmingly on private initiative, with the public confined to the role of investing partner and provider of supportive infrastructure (material and immaterial) and services.

Overarching is undeniably the question of institutional quality, needed as the underlying canvas to support whatever initiative we hope to see blooming.  A proposal that did not make it to the finals, though, involved the creation of a stable watchdog, either on local policies in general (and in particular on the use of the royalties) or more specifically focused on the environmental and health impact of the extractive activity. According to the more politically experienced participants, no administration would agree to finance an independent body with the explicit mandate to criticize them. Never mind that this type of institutions is common in other places. In Italy, the one body that currently operates with a watchdog function on the public administration, although limited to the financial aspect,[8] is facing threats of limitations of its powers. A lot remains to be learned. However, the perhaps most valuable outcome of this experience was, if not yet policy change at least a promising method to produce change, by mobilizing a latent ‘local’ resource and really transform oil rents in durable intangible capital.

References

  • Where Is the Wealth of Nations? Measuring Capital for the 21st Century. Washington, DC: The World Bank, 2006
  • The brain drain in Spain is mainly to Spain’s gain, The Economist, April 2012
  • The Inclusive Wealth Report 2012, Cambridge University Press, 2012
  • Rapporto sull’economia del Mezzogiorno, SVIMEZ, 2012
  • Peer effects in science: evidence from the dismissal of scientists in Nazi Germany, Waldinger, F., The Review of Economic Studies, 2012

[1] Updates on these figures for a subset of 20 countries can be found in the newly released Inclusive Wealth Report 2012 , sponsored by a number of UN agencies, the first of what is intended to be an annual report looking at a broad measure of wealth. From the report: “Wealth is the social worth of an economy’s assets: reproducible capital; human capital; knowledge; natural capital; population; institutions; and time.”

[2] The Economist recently pointed out that “[w]hat some call “brain-drain” may in fact be a win-win situation for Europe’s economies. […I]n the short run, migration takes away pressure from budgets as the unemployed don’t claim benefits but move [abroad] instead. In the long run, there is a pool of highly skilled workers who have not fallen victim to hysteresis effects and can be re-activated for the [home] economy once the crisis is over.”  However, it is not at all obvious that this migration is short-run, i.e. that these high-skilled workers will eventually go back. A survey of Italian scientists working aboard reveals, for instance, that the overwhelming majority excludes ever going back to Italy.

[3] The “import” of such people generally more than compensates the “export” in other big European countries.

[4] Source: SVIMEZ, 2012.

[5] A recent paper analyzing the experience of New Zealand (Davenport, 2040) reviews the waves of brain-drain response policies and calls this latest generation diaspora policies: “Diaspora policies are based on an assumption that many expatriates are not likely to return, at least in the short term, but represent a significant resource wherever they are located. This resource is not just embodied in the individual expatriate but also potentially includes their socio-professional networks. A key advantage of any diaspora option is that such connectivity initiatives do not require a large infrastructural investment in order to potentially mobilize this latent ‘national’ resource.”

[6] Source: ISTAT.

[7] Sponsors and partners included the municipal and regional administration, the Italian Institute for Asia and Mediterranean (ISIAMED) and its local branch, CeBasMed, the Val d’Agri National Park, the Regional Environmental Protection Agency, SVIMEZ and the University of Basilicata.

[8] The Corte dei Conti tribunal.