- Abdollahmilani, M. & Akbarpourroshan, N., (2012). “Tax Evasion from the Underground Economy in Iran”. Journal of Tax Research, 20 (13): 141-168. (In Persian).

- Arabmazar Yazdi, A., (2001). “Shadow economy in Iran, its size, causes and effects in the last three decades”. Planning and Budgeting, 6(2, 3): 3-60. (In Persian)

- Ardakani, O. M., (2023). “The dynamics of money velocity”. Applied Economics Letters, 30: 13, 1814-1822, DOI: 10.1080/13504851.2022.2083062

- Ariyo, A. & Bekoe, W., (2011). “Currency Demand, the Underground Economy and Tax Evasion: The Case of Nigeria”. Journal of Monetary and Economic Integration, 11(2): 130-157.

- Ashena, M. & Laalkhezri, H., (2021). “Dynamic Correlation of Exchange Rate, Export and Import Volatility with The Global Economic Policy Uncertainty Index (Application of M-GARRCH and DCC Approach)”. Journal of Applied Economics Studies in Iran, 10(37): 135-167. (In Persian). doi: 10.22084/aes.2021.22895.3184

- Benk, S.; Gillman, M. & Kejak, M., (2008). “Money Velocity in an Endogenous Growth Business Cycle with Credit Shocks”. Journal of Money, Credit and Banking, 40(6): 1281-1293.

- Bordo, M. D.; Jonung, L. & Siklos, P., (1997). “Institutional Change and the Velocity of Money: A Century of Evidence”. Economic Inquiry, 35(4): 710-724.

- Breusch, T., (2005). “Australia’s Cash Economy are the Estimates Credible?” Economic Record, 81: 394–403. doi:10.1111/j.1475-4932.2005.00277.x.

- Cagan, P., (1958). “The Demand for Currency Relative to Total Money Supply”. National Bureau of Economic Research, Occasional Paper, 62 (New York).

- Dell'Anno, R. & Solomon, O. H., (2008). “Shadow economy and unemployment rate in USA: is there a structural relationship? An empirical analysis”. Applied Economics, 40(19): 2537-2555.

- Eilat, Y. & Zinnes, C., (2000). “The evolution of the shadow economy in transition countries: consequences for economic growth and donor assistance. Harvard Institute for International Development”. CAER II Discussion Paper, 83: 1-70.

- Elbahnasawy, N. G., (2021). “Can e-government limit the scope of the informal economy?”. World Development, Elsevier, 139(C): 105341.

- Elgin, C. & Iyidost, E., (2021). “Velocity of money and shadow economy”. Applied Economics Letters, DOI: 10.1080/13504851.2021.1961117.

- Elgin, C. & Öztunalı. O., (2012). “Shadow Economies around the World: Model Based Estimates”. Bogazici University Department of Economics Working Papers, 5: 1–48.

- Elgin, C.; Kose, A.; Ohnsorge, F. & Yu, S., (2019). “Shaded of Gray: Measuring the Informal Economy and Its Business Cycles”. World Bank, mimeo.

- Faal, E., (2003). “Currency Demand, the Underground Economy, and Tax Evasion: The Case of Guyana”. IMF Working Paper, Western Hemisphere Department, January

- Faig, M. & Jerez, B., (2005). “Precautionary Balance and the Velocity of Circulation of Money”. University of Toronto, Department of Economics. Working papers. Series data maintained by RePEc Maintainer.

- Feige, E. L., (1979). “How Big Is the Irregular Economy?”. Challenge, 22 (1): 5–13. doi:10.1080/05775132.1979.11470559.
Feige, E. L., (1990). “Defining and Estimating the Underground and Informal Economies: The New Institutional Economies Approach”. World Development, 18(7): 989-1002.

- Fotros, M. H. & Dalaei Milan, A., (2016). “Examination of Underground Economy and Tax Evasion within the Framework of Dynamic Stochastic General Equilibrium Models (DSGE)”. Economic Growth and Development Research, 7(25): 65-84. (In Persian)

- Fotros, M. H. & Dalaei Milan, A., (2014). “Effective factors on Iranian Underground Economy1963-2012”. Quarterly Journal of Quantitative Economics, 10(4): 91-111. (In Persian). doi: 10.22055/jqe.2014.11625

- Frey, B. S. & Weck-Hanneman, H., (1984). “The hidden economy as an unobservable variable”. European Economic Review, 26: 33-53.

- Friedman, M., (1988). “Money and the Stock Market”. Journal of Political Economy, 96(2): 221–245. http://www.jstor.org/stable/1833107

- Giles, D. E. A., (1998). “The Underground Economy: Minimizing the Size of Government”. Department Discussion Papers 9801, Department of Economics, University of Victoria.

- Giles, D. E.; Tedds, L. M. & Werkneh, G., (2002). “The Canadian Underground and Measured Economies: Granger Causality Results”. Applied Economics, 34: 2347-2352.

- Ihrig, J. & Moe, K. S., )2004(. “Lurking in the shadows: the informal sector and government policy”. Journal of Development Economics, 73(2): 541-557.

- Karbor, R.; Karimi Takanlou, Z. & Rostamzadeh, P., (2019). “Estimation of Underground Economy in Iran's Provinces and Effective Factors”. Quarterly Journal of Applied Theories of Economics, 6(2): 161-188. (In Persian)

- Karimi, M.; Delangizan, S. & Heidarian, R., (2018). “Determinants of the Factors Effecting Underground Economy in Iran (1976-2010): A Vector Error Correction Model”. Journal of Economic Research (Tahghighat- E- Eghtesadi), 53(2): 367-386. (In Persian). doi: 10.22059/jte.2017.221471.1007406

- Kholodilin, K. A. & Thiessen, U., (2011). “The Shadow Economy in OECD Countries: Panel-Data Evidence”. Discussion Papers of DIW Berlin 1122, DIW Berlin, German Institute for Economic Research.

- Kim, H. & Subramanian, C., (2009). “Velocity of money and inflation dynamics”. Applied Economics Letters, 16: 18, 1777-1781, DOI: 10.1080/13504850701719652

- Loayza, N., (2016). “Informality in the Process of Development and Growth”. The World Economy, 39 (12): 1856-916

- Medina, L. & Schneider, F., (2017). “Shadow Economies Around the World: New Results for 143 Countries Over 1996-2014”. Discussion Paper, Department of Economics, University of Linz, Linz, Austria.

- Mendizábal, H. R., (2006). “The Behavior of Money Velocity in High and Low Inflation Countries”. Journal of Money, Credit and Banking, 38(1): 209–228. http://www.jstor.org/stable/3839075

- Motallebi, M.; Alizadeh, M. & Faraji Dizaji, S., (2020). “Estimating Shadow Economy and Tax Evasion using Governmental Financial Discipline Variables”. Quarterly Journal of Quantitative Economics, 16(4): 69-100. (In Persian). doi: 10.22055/jqe.2019.26886.1926

- Najafian, S.; Fotros, M. H. & Haji, G., (2022). “Analysis of the effects of the shadow economy on the per capita income of selected developing and developed countries”. Journal of Iranian Economic Issues, 9(2): 331-363. (In Persian). doi: 10.30465/ce.2022.40670.1767

- Omer, M., (2014). Velocity of Money Functions in Pakistan and Lessons for Monetary Policy Velocity of Money Functions in Pakistan and Lessons for Monetary Policy. SBP Research Bulletin.

- Omidipour, R.; Pajooyan, J.; Mohamadi, T. & Memarnezhad, A., (2016). “Estimating the size of the underground economy and tax evasion: an empirical analysis in Iran”. Journal of Tax Research, 23(28): 69-94. (In Persian)

- Onnis, L. & Tirelli, P., (2015). “Shadow economy: does it matter for money velocity?”. Empirical Economics, 49 (3): 839-858. ISSN 0377-7332.

- Orviská, M.; Čaplánová, A.; Medved, J. & Hudson, J., (2006). “A Cross Section Approach to Measuring the Shadow Economy”. Journal of Policy Modeling, 28(7): 713-724.

- Owoye, O., (1997). “Income Velocity and the Variability of Money Growth: Evidence from Less Developed Countries”. Applied Economics, 29: 485- 496.

- Pesaran, M. H.; Shin, Y. & Smith R. J., (2001). “Bounds Testing Approaches to the Analysis of Level Relationships”. Journal of Applied Econometrics, 16 (1): 289-326.

- Pesaran, M. H. & Shin, Y., (1998). “An Autoregressive Distributed-Lag Modelling Approach to Cointegration Analysis”. Econometrics and Economic Theory in the 20th Century: The Ragnar Frisch Centennial Symposium, 31: 371-413.

- Piraee, K. & Rajaee, H., (2015). “Estimate Size of Underground Economy in Iran and Investigation Causes and Effects”. Quarterly Journal of The Macro and Strategic Policies, 3(3: 9): 21-42. (In Persian)

- Prasetyo, A. S., (2018). “Determinants of Demand for Money and The Velocity of Money in Indonesia”. JDE (Journal of Developing Economies), 3(2): 65–79. https://doi.org/10.20473/jde.v3i2.10464

- Rami, G., (2010). “Velocity of Money Function for India: Analysis and Interpretations”. SSRN Electronic Journal, 1(1): 15–26. https://doi.org/10.2139/ssrn.1783473.

- Roy, J.; Rochaida, E.; Suharto, R. B. & Rizkiawan, R., (2021). “Digital and electronic transactions against velocity of money”. Corporate Governance and Organizational Behavior Review, 5(2): 145–155. https://doi.org/10.22495/cgobrv5i2sip3

- Sameti, M.; Sameti, M. & Dalali Milan, A., (2010). “Estimating the Underground Economy in Iran (1965-2005): A MIMIC Approach”. International Economics Studies, 35(2): 89-114. doi: 10.22108/ies.2023.15520 (In Persian).

- Samsami, H. & Nokhodbriz, N., (2019). “The effect of electronic payment tools on inflation and speed of money circulation”. Financial Economics, 12(45): 193-212. (In Persian)

- Schneider, F., (2008). “Shadow Economy. In: Readings in Public Choice and Constitutional Political Economy”. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-75870-1_28

- Schneider, F. & Buehn, A., (2017). “Estimating a Shadow Economy: Results, Methods, Problems, and Open Questions”. Open Economics, 1: 1-29. 

- Schneider, F.; Buehn, A. & Montenegro, C. E., (2010). “Shadow Economies All over the World: New Estimates for 162 Countries from 1999 to 2007”. Policy Research
Working Paper 5356, World Bank, Washington, DC.

- Schneider, F. & Enste, D., (2000). “Shadow Economies: Sizes, Causes and Consequences”. Journal of Economic Literature, 38 (1): 77-114.

- Shin, Y.; Yu, B. & Greenwood-Nimmo, M., (2014). “Modelling Asymmetric Cointegration and Dynamic Multipliers in a Nonlinear ARDL Framework”. In: Sickles, R., Horrace, W. (eds) Festschrift in Honor of Peter Schmidt. Springer, New York, NY. https://doi.org/10.1007/978-1-4899-8008-3_9

- Taghineghad, V. & Nikpoor, M., (2014). “Underground Economy and its causes: a Case Study of Iran”. Journal of Applied Economics Studies in Iran, 2(8): 53-72. (In Persian)

- Tanzi, V., (1980). “The underground economy in the United States: Estimate and implications”. Banca Nazionale Del Lavoro, 135/4: 427-453

- The Central Bank of the Islamic Republic of Iran. (2002-2019). Economic Statistics. https://cbi.ir/simplelist/LatestEconomicData_fa.aspx

- World Bank. (2021). Informal Economy Database. https://www.worldbank.org/en/research/brief/informal-economy-database.

- World Bank. (2019). Global Economic Prospects, World Bank. http://hdl.handle.net/10986/31655.

- Zarra-Nezhad, M.; Zarea, M. M. & Akaberi, M., (2011). “Estimation of Velocity of Money and Liquidity in Iran’s Economy”. Quarterly Journal of Quantitative Economics, 8(1): 123-145. doi: 10.22055/jqe.2011.10632 (In Persian).