At the time it collapsed in 1991, the soviet union possessed all of the factors that promote increases in economic growth except:

a political and legal environment that promoted economic productivity.

Explanation:

When a country collapses, it doesn't just happen suddenly because its residents decided that one that specific date a public revolt would occur. It is a process that takes a relatively long time to happen, depending on the country it may take a couple of years or even several years.

In the case of the Soviet Union, it was one the most powerful nations in the world but it was also a very corrupt nation with an extremely rigid command economy. That means that the government decided on most economic affairs and it didn't favor private businesses. Communism was an economic doctrine where the government was in total control of the economy, therefore not a lot of private companies were willing to risk investing in that country.