Don't forget, when you gain money from stocks' market value, someone is giving it to you. The one shorting is betting that stock will go down, but the one selling the short to you is betting the stock will go up.
I used to work at a stock broker and shorting has been explained differently to me: when shorting you sell shares you borrow (rent) from someone else. Going short is basically selling something you don't have at all. At the end of the short you have to buy the shares at market price and the profit/loss is made at that point.
You and I are in total agreement on what shorting is - you said it with all the steps of the composite transaction without simplification.
I worded it in a very confusing way with the terms "shorting" and "shell the short to you". That was entirely my wording problem.
If
you are the one shorting and I am your transaction partner, I am selling you the opportunity to borrowing from me - ie:
selling a loan to you. I worded it as "I am selling the short to you", that is confusing and that's my fault.
For a discussion of the merit of shorting however, it actually is irrelevant who is the seller and who is the buyer.
But - the buy/sell is entirely unnecessary (mathematically speaking).There is no need for me to
borrow->sell->delay->buy->return at all. When simplified, it is merely a transaction of "cash equal to stock value" in a simple
borrow->delay->return transaction.
So, the transaction distills to: I borrow from you
cash equal to the value of 20 shares of Tesla stock, and I promise to repay you the
cash equal to the value of 20 shares of Tesla in 3 days.
I am betting the stock will drop, I am re-paying you $ equal to 20 shares, and it will be less due to the drop.
You are betting the stock increased, In 3 days, the stock will worth more, so I will be paying you back more.