Arbitrage is “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.” Once the arbitrage spread closes, the profit is made and the opportunity no longer exists. According to Austrian Economics, entrepreneurs’ profits “derive from the services he performs in detecting and eliminating arbitrage opportunities, thereby allowing supply and demand for a given good to meet.” By recognizing and acting on opportunities, the entrepreneur moves markets toward equilibrium. So entrepreneurial arbitrage is a low-risk way of exploiting gaps between what the market demands and what it’s being supplied until the spread closes.
There is very little “invention” involved—startups imitate or slightly modify someone else’s idea and only introduce breakthrough products or new business models many years later. This is what Peter Drucker calls creative imitation. The technology and market demand already exist, but the creative entrepreneur understands what the innovation represents better than the original innovators. This also includes packaging current technologies into new business models. Paul Graham calls this an idea that’s “a square in the periodic table”—if it didn’t exist now, it would be created shortly.