Marx's value theory explores how money, markets, and prices in capitalism reflect the way goods are produced. It shows how labor time affects prices and how capitalism relies on exploiting workers for profit. The theory suggests that under capitalism, people's work serves the interests of capital rather than their own. To fully understand Marx's theory, we need to see labor as a form of self-limiting activity. This means that labor is constrained in certain ways that affect how markets, prices, and money operate.