> Imagine if you went to your stock broker to buy 10 shares of XYZ. Your broker tells you that the market price is $100 per share, but in reality found a seller

> Imagine if you went to your stock broker to buy 10 shares of XYZ. Your broker tells you that the market price is $100 per share, but in reality found a seller at $80/share and is pocketing the difference, without disclosing this to either party in the transaction. That's a poor analogy, because the stock is an exchange value, but the car ride is a use value. A better analogy would be buying a pear, and getting angry that the fruit stand bought the pear really cheaply, without passing the savings on to you.