is another term for a market economic system.

It's definitely not Capitalism as capitalism is the "opposite" of a market economy - it's a free market economy, not command economy (market economy is the same as command economy).

Actually both Communism and socialism are forms of market economy - perhaps Communism is more typical so it's a better answer but both are correct. 

Ithink or blue

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

producing or giving rise torelating to or engaged in the production of goods, crops, or other commodities.

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.