Answer:
It allowed more private ownership of farms and businesses, increasing production.
Step-by-step explanation:
We can arrange the information in this manner:
Output 1913 1921 1928
Coal 29.0 9.0 35.0
Grain 80.0 37.6 73.3
Iron & Steel 8.5 0.3 7.3
The New Economic Policy lasted from 1921 to 1928, and it represented an economic reform that added some market policies to the mostly centralized, planned economy.
As we can see, the New Economic Policy was succesful. In 1928, the year the policy was ended, production of coal, grain, and Iron & Steel had increased with respect to 1921, the year the policy was started.