To believe newscasters, stock markets rise when there are more buyers than sellers and fall with the converse. To consummate a transaction, there must be both a buyer and seller. It is more proper to say that stock markets rise when more people are motivated to buy shares than sell them at a given price. To balance that optimism, sellers require more money to part with their shares. Similarly, price declines reflect that to induce people to purchase shares, they must lower prices. Whatever...