Depends on the period. I only remember the 80s in Poland, and money were almost useless. If you wanted to buy a car or a flat in big city - you signed onto a waiting list, paid part of the money, and waited for 5-20 years. No amount of money could speed that up.

If you bought a car, drove home, and sold it immediately - you would earn more than 100% on that transaction. But nobody did that, because everybody had money and only about half of the families had cars.

Each year you had the right to by 2 pairs of "winter shoes" shoes per person. You bought them no matter if it was the correct size of style, because you later bartered them for the stuff you need. Same with other "rare" stuff like coats or exotic fruits. Most people in Poland seen oranges and bananas once a year on christmas.

Lowest level manual workers earned half or 1/3rd of what a chairman of a big state company would earn. But the low level manual worker knew nobody important, so he waited for 20 years to buy a shitty socialist car, while the state company chairman got a western-made car after a few weeks of waiting.

It wasn't because of the price - it was because he knew people and could give them favors.

I have asthma, during communism my parents got the modern drugs for it mailed every few months from the family in Canada, because no amount of money could buy them in Poland in 80s. They only had outdated drugs for asthma that had awful side effects.

Fiat 126p (which was outdated in 70s in Italy) was produced in Poland till 2000. It took 26 seconds to accelerate to 100 km/h, and in case you had an accident in it going over 50 km/h everybody inside died. It was awful, awful car. But it was what was available, so people took it.

My parents build a house in 80s, and money weren't an issue. They took 30 years mortgage and paid it all off in 1991 thanks to my father going for 4 months to Austria to work on a farm. But the availaibility of materials in 80s was the real bottleneck. We had roof made from asbestos (it was called "eternit"), and while people knew it wasn't the best thing to use - nobody cared because that was what you could get. People stockpiled it on their backyards in case they will want to build a house for their children.

So yeah - the important currency wasn't the money, it was favors and coupons allowing you to buy stuff for your money.