@yogthos It's not true. Here's the graph of Poland's Gini index (higher=more inequality) from 1800 till 2019. As you can see inequality has fallen significantly in the beginning of 20th century (II Rzeczpospolita), then inequality started rising (!) after Soviet occupation and communist Poland, further increased during 90's and then started falling again after 2000. You can play with the graph here https://bit.ly/2lOgFLn