When I was young, the Chairman promised us all food. He promised that we would never go hungry again or be without work; my family was led to a village where we became members of a production team. We worked hard, long hours but we were fed every day. The commune prospered at first, but soon people did not meet their quotas and we did not increase our production. We all received the same amount of rice; it didn't matter how much work we did. With the new Chairman, things are different in our village. The government has given us plots of land to work as our own, though I still put in time as a commune worker. We can now keep the amount we produce above the quota set by the government. This has made most of us work harder and the government quotas are being met for the first time.
––Conversations with a Farmworker (1986)
Under the Chairman mentioned in the first paragraph, which economic idea was introduced to increase production?