I look at my annual budgets for everything and anything, and I look to see where I can save the most money on those items. Saving 30% to 50% buying in bulk - replenishable items from toothpaste to soup, or whatever I use a lot of - is the best guaranteed return on investment you can get anywhere.
Mark CubanKnow your stuff. Have an angle. Know how to grow business, how to develop products, have patents and an undeveloped market that could be huge.
Mark Cuban