Getting wealthy or attaining a certain level of income is just like achieving any other goal. To get there, you need to ensure that you set those goals the right way. Set SMART goals and be very specific about them. Don't set them arbitrarily in your mind. Write them down and come up with powerful reasons why you absolutely must achieve them. That's one of the biggest and most potent internal transformations that you could make in your mind.
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.