Others blame the Heath government's fixing of rent price rises in 1971.[1] The only book-length study of the crisis by Reid (1982) blames all those factors but also a bubble of housing prices that saw a 50% increase in London real estate prices over 1971 and the financial uncertainty caused by the end of the Bretton Woods agreement and the inconclusive elections of February 1974. The period was also marked by a series of crises, including the political uncertainty of the Heath government, waves of public sector and industrial strikes and oil shortages that led to a government-mandated three-day work week. However, Reid also blames the entire market culture of the London banking institutions from the late 1960s, which she considers made market speculation (and consequent crashes) inevitable.[2]