Light industrial output was vital for a developing country that was working with relatively little capital. With its short gestation period, low capital requirements, and high foreign exchange export earnings, the revenues that the light-manufacturing sector generated could be reinvested in more technologically advanced production and further capital expenditures and investments. However, these investments were not government-mandated, in sharp contrast to the similar but much less successful reforms in Yugoslavia and Hungary. The capital invested in heavy industry largely came from the banking system, and most of that capital came from consumer deposits. One of the first items of the Deng reforms was to prevent reallocation of profits except through taxation or through the banking system; hence, the reallocation in more "advanced" industries was somewhat indirect. In short, Deng's reforms sparked an industrial revolution in China.