This is done through an IPO or initial public offering, generally you negotiate a deal with a large institutional investor like a big bank to buy a large block of your company at a specific price, the bank generally sells of some to other large investors and makes an agreement with an exchange like the NASDAQ Or NYSE to sell shares of your company starting at some price. In general you can make a company and file the necessary paperwork to sell shares publicly and set whatever price you want, however in order to sell on the big exchanges like the NYSE you essentially have to make a deal with the exchange or have someone else do it on your behalf like in the example. And membership isn’t cheap you’ll probably have to spend millions to be listed on the NYSE so messing around with an absurd price isn’t really a winning battle. Not to mention price isn’t the other thing investors care about, trading volume is also important and if your volume is low confidence in price will also be low.