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In page Great Leap Forward:

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Apart from progressive taxation on each household's harvest, the state introduced a system of compulsory state purchases of grain at fixed prices to build up stockpiles for famine-relief and meet the terms of its trade agreements with the Soviet Union. Together, taxation and compulsory purchases accounted for 30% of the harvest by 1957, leaving very little surplus. Rationing was also introduced in the cities to curb 'wasteful consumption' and encourage savings (which were deposited in state-owned banks and thus became available for investment), and although food could be purchased from state-owned retailers the market price was higher than that for which it had been purchased. This too was done in the name of discouraging excessive consumption.[citation needed]