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In page Economy of Iran:

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Iran's educated population, high human development, constrained economy and insufficient foreign and domestic investment prompted an increasing number of Iranians to seek overseas employment, resulting in a significant "brain drain".[37][41][42][43] However, in 2015, Iran and the P5+1 reached a deal on the nuclear program which removed most international sanctions. Consequently, for a short period, the tourism industry significantly improved and the inflation of the country was decreased,[citation needed] though US withdrawal from the JCPOA in 2018 hindered the growth of the economy again and increased inflation.[citation needed]