Summarize this article in one sentence.
Competition is a constant factor in human interaction. Not only do businesses compete, but individuals compete for resources all the time.  Use competition as a way to drive yourself and others. For example, when completing a project at work, consider judging yourself against other workers completing similar projects. This may drive you to work harder. Competition often results in “creative destruction.” Through the competitive process, certain individuals or firms decline and make room for new innovative entities to dominate the marketplace. Interactions between people constantly introduce new and unplanned factors into the decision-making process. As a result, you should reflect on potential outcomes before you make an economic decision. Consider how your spending habits impact your community. For example, if you shop at a local hardware store instead of a big box retailer, you'll likely benefit people who live near you instead of very wealthy people hundreds of miles away. Ultimately, mutually agreeable exchange tends to foster friendships between people. As a result, when conducting business, treat others fairly with the goal of forming long-term relationships.  Seek your own self interest, but consider that making someone else happy and treating them with respect might be in your long-term benefit. When buying or selling something, consider offering or asking less money if you think you might do a lot of business with the person in the future.

Summary:
Embrace competition. Think about the implications of any choice you make. Rely on fair trade and commerce as a way of building healthy relationships.