- First of all: yes, there were often shortages of products that were not considered essential, and thus were not regulated by the central economic plan. Which would only show the inefficacy of a non-regulated economic system.
- Second of all: most of the photos of empty Soviet supermarkets come from the 80s, when the Soviet economy was already collapsing due to the introduction of liberal policies that deviated from a planned economic system. So, again, this only proves the flawed nature of capitalism.
So the next time you see a photo of empty shop shelves in the Soviet Union, ask about the context. Most of the times, it will show the consequences of either a devastating war, or the introduction of liberal policies that sabotaged the Soviet planned economy.