I understand Reverse-Mergers generally, but I don't really understand how the money works. ?People? buy stock in an existing 'shell' company. The shell compan

I understand Reverse-Mergers generally, but I don't really understand how the money works. ?People? buy stock in an existing 'shell' company. The shell company buys the target company and immediately re-brands itself as the target company. I guess I don't understand valuation and dilution and who has ownership after the acquisition. It would seem that the founder would want to have a lot of the stock (more than 50%), but the owners of the shell company would also want to retain the ownership of their stock... Where does the stock come from for equity for the founders and employees?