Or 1 million people sold $1 worth of Apple. If you want to execute a large trade, you'd probably have to buy from several sellers, and (my limited understanding

Or 1 million people sold $1 worth of Apple. If you want to execute a large trade, you'd probably have to buy from several sellers, and (my limited understanding of the market is that) you'd do so by matching sell orders in ascending order, thus pushing the market value up.