China's boom was caused by Deng Xiaoping allowing farmers to keep some of their grain, so that their effort led to results.

Judge as of 2022-07-04, against economic-history scholarship. The claim says this rural reform was the key reason China boomed. TRUE: economists and historians broadly identify the household responsibility system (farmers keeping output above state quotas), introduced or endorsed under Deng, as the main cause of China's economic boom. MOSTLY TRUE: it is widely treated as the leading or first driver, with other factors secondary, and only minor details are off (e.g. it began with local initiative such as Xiaogang village before Deng endorsed it). MOSTLY FALSE: the reform is recognised as an important early driver, especially of rural growth in 1978–84, but scholarship attributes the boom to several factors (opening to trade and FDI, special economic zones, township and village enterprises, price liberalisation, etc.), so calling it 'the' reason states a part as the whole. FALSE: no such policy existed under Deng, or it had no significant economic effect.

Set before the research began.

1. E1 China's 40 Years of Reform and Development: 1978–2018 ANU Press

   “The Fourth Plenum of the Eleventh Central Committee of the Communist Party (CCCP) officially adopted the HRS in September 1979. The subsequent rapid increases in agricultural output and farmers’ incomes provided support for this system.”

2. E2 III Reform of the Domestic Economy International Monetary Fund (eLibrary)

   “Of all the major reforms introduced since 1978, perhaps the most successful and complete is the change in the organization of agriculture. Since 1983, the household responsibility system has remained the principal organizational form of farming.”

3. E3 [PDF] Sources of China's Growth - UC Davis Economics Department UC Davis Economics Department (Wing Thye Woo, working paper) · October 1997

   “The first phase is the 1979-84 period where the agricultural sector was an important contributor to growth.”

4. E4 What Really Made China Rich w/ Yasheng Huang uscnpm.substack.com (Substack newsletter interview) · 8 September 2026

   “The financial reforms of the 1980s, even though limited to the rural areas, had a disproportionately contributory effect on the overall entrepreneurial and market development because rural China was already predisposed toward small-holder capitalism in the first place.”

The evidence shows the household responsibility system was adopted in 1979 and followed by rising farm output (E1), was perhaps the most successful of several major reforms (E2), and was an important contributor to growth in 1979–84 (E3). It does not identify the other factors behind China's boom or say whether this reform was the main cause, so it cannot distinguish the mostly-true case from the mostly-false case under the criteria.