Selling clothes you no longer wear is a quick way to make some money. Start with local consignment shops for faster cash, or use sites like ThredUp and Poshmark to find buyers. If you go the online route, be sure to take clear, well-lit photos of your pieces and research similar items to set competitive prices. Get tips on how to sell your clothing.
If you're unfamiliar with the concept of arbitrage, here's how it works. Wikipedia describes an arbitrage as effectively, "the practice of taking advantage of a price difference between two or more markets: striking a combination of matching deals that capitalize upon the imbalance, the profit being the difference between the market prices." Clothier was able to identify arbitrage opportunities in the grocery industry with precision.
When an airplane leaves from one city to the next, it has a plan. Its plan is called a flight plan. It's a massive action plan that involves speed, altitude, direction of travel and many other facets. But what happens when there's turbulence or air-traffic congestion or it needs to change course for some other reason? The plane changes its plan. But it doesn't change its goal of where it's going. Create and follow a plan, and don't be afraid to change it if you see something isn't working.