Why the USSR collapsed?

Many modern political scientists attribute the collapse of the USSR to its failed economy. Command economy, the economic scheme that the USSR adopted for its entire course, proved ineffective. Such a scheme lacked the power of the “invisible hand” to optimize productivity and relied highly on the economic plan of the leaders who, more often than not, had no access to critical and accurate information. The western world understood this well and started a “containment” strategy in which it contained the development of the USSR via economic and financial approaches. The involvement of the quagmire war in Afghanistan (a lesson that the US did not learn either) and the costly “Star war” campaign made things even worse. As people became angry and desperate when they saw empty stores, it seems true that the failed economy played an essential role in the collapse of the USSR. However, an angry and disappointing population is not uncommon in authoritarian systems, most of which, instead of destruction, chose to suppress such sentiment even harder in one way or another.