Despite the recent economic meltdown, most people would agree that free markets have improved the lives of billions of people. Many people today are living longer and wealthier than anyone ever has, in large part because free markets incentivize us to create products that other people want to buy. Entrepreneurs who knew that they would profit from their efforts invented vaccines, computers, microwaves, and indoor plumbing.

However, free markets are not an unqualified good. They’re simply the most efficient way to provide consumers what they want. What markets can’t do is tell us what we should want. If consumers want relief from the heat of summer, markets will connect them with the sellers of air conditioners. If consumers want to get rich quick through games of chance, markets will supply them with casinos.

In short, markets amplify whatever we are. If you want to know who you are, look at what you buy—it’s yourself revealed. What is on your iPod, credit card statement, or television schedule? The fruit you find there indicates what kind of tree you are (Matthew 7:17-18,20).

Markets also amplify by enlarging our effect on others. A medieval materialist would horde his gold, and that would be the end of it. But now, through the amplifying power of markets, a materialist who buys a behemoth home supports an entire industry that builds McMansions, and an immoral person who clicks on pornography encourages producers to make more of it.

Every purchase is a vote for the product we buy. If we choose coarse, banal, or risqué entertainment, our culture will flood the market with more.

No man is an island. That has never been truer than now. And God will some day judge the choices we make today (Matthew 7:19; Hebrews 6:8).

NLT 365-day reading plan passage for today: Esther 3:1-15