Okay kiddo, let me explain what quasi-rent means. Imagine you have a really cool toy that all the kids in the playground want to play with. One day, a new kid comes to the playground and wants to play with your toy. But, instead of asking to borrow it, he offers to pay you some money to let him play with it.
Now, you don't want to let go of your toy forever, but you also want to make some money. The money the new kid offers is called quasi-rent. It's like rent because he is paying you to use your toy, but it's not a long-term thing like renting a house or an apartment.
In economics, quasi-rent is a similar concept. It refers to the extra money that a producer or a seller earns from selling or renting out something that they own, in excess of what it cost them to produce or acquire it. For example, a company may buy a specialized machine that is expensive to produce, and then rent it out to other companies at a high price to make a profit. In this case, the extra income the company earns from the machine, that exceeds its original cost, is called quasi-rent.
So, just like you made some money by letting the new kid play with your toy, producers and sellers make extra money by using their resources, assets, or skills in the market, which is called quasi-rent.