“…Informal payments, also referred to as unofficial, "enveloped", under the counter or under the table payments, continue to represent a worldwide phenomenon, affecting both developed countries 1 and developing or in transition economies. 2,3 Studies concerning the subject have been conducted in countries from: Central and Eastern Europe, eg, Poland, 4,5 Hungary, [6][7][8][9][10] Bulgaria, 5,[11][12][13][14] Lithuania, 4,5 Albania, 15 Ukraine, 4,5,16 Romania, 5,13,[17][18][19] Russia 3,20,21 ; Central, Eastern and Southern Asia 22 ; southern regions of America, 23 and the African continent. [24][25][26] Informal payments are widespread in many transition economies of post-communist Europe and the former Soviet Union, and constitute a feature of the unreformed Semashko systems (the health care model first introduced in the Soviet Union in 1930, and then replicated in other communist countries).…”