The study looked at how easily stocks can be bought or sold on the Athens Stock Exchange. They found that it's harder to trade large amounts of stocks than small amounts. Liquidity commonality, which means how similar stocks behave in terms of trading ease, is low at the basic level but increases as you try to trade more stocks. This means big traders face more risks when trying to buy or sell a lot of stocks. The study also suggests that trading information is not shared at the same speed for all stocks, which can affect how easily trades can be made.