Off the back of MrB’s explanation, a simplified example that might help visualise what happens to the money involved in buying and selling stocks:
Let’s say the current share price of Apple is $200.
Timmy Paperhands wants to buy a share at $200. They deposit $200 from their bank account to their choice of exchange (eg. Trading212, eToro, Robinhood etc). They then place a ‘buy order’ for 1 share. The exchange then matches that with someone (let’s say Chad McSellhigh) who has put up a sell order at $200, or thereabouts. There are thousands of buying and selling transactions happening at any given moment, so this match-up usually occurs pretty quickly.
Timmy now owns 1 share of Apple by paying $200, and Chad has received $200 for selling his share. Timmy hasn’t paid $200 directly to Chad as such, as their transactions are both facilitated by the exchange.
Now, let’s say the Apple share price tanks to $150/share the following week. This has happened because more of those transactions are sales than purchases, which pushes the price down. This might be due to a multitude of reasons, for example a quarterly sales target was not met for iPhones and therefore Apple investors lost faith in public demand for iPhones.
When he looks at his screen, Timmy Paperhands thinks, well gosh darn, he’s ‘lost’ $50, because he paid $200 for his share. In reality however, Timmy hasn’t actually lost or gained anything until he decides to sell that share. Because Timmy is a new trader and doesn’t know any better, he gets scared in case the share price sinks any lower, and decides to sell at $150. At that point of sale, Timmy has lost $50.
It just so happens, that Chad McSellhigh believes this lower share price of $150 presents a buying opportunity, and decides to buy a share. Since he sold his original share at $200 and just bought another at $150, he is now the proud owner of an Apple stock again, but also has an extra $50 in his bank account compared to before. Poor Timmy Paperhands on the other hand is down by $50. Overall, the same amount of dollars exist, but one person has ended up with more of them than the other.
That, on a very basic level, is an example of how wealth transfer can occur during the trading of stocks and shares. The same amount of money exists, it’s just that it’s changed hands via the means of buying and selling shares. This is also an example of why Rudy is often heard saying that market downturns are “where wealth is made”.