They found on average a 19% difference between the highest and lowest socialstratainthe risk of dying in each country and about half of the difference was due to the risk of being killed by smoking.
Society being composed of socialstrata a family will find its children in competition with children from families in roughly the same social-economic stratum, with roughly the same total amount of family income to invest in children.
The checking of cards revealed the epic proportions of repressions, whose victims included not only all ethnic groups and socialstrata of the USSR, but thousands of foreign nationals who happened to be inthe wrong place at the wrong time and were consumed by the Soviet prison system.