From an economic perspective, it is important to have oil prices cheap for consumers, but also somewhat profitable for suppliers. Currently, oil prices have been on the decline at rates that I've never seen for any other commodity and the correlation to the stock market is incredible. By having a $10 tax it makes oil more costly for big corporations to succeed. Also, it makes it more likely to invest in alternative energies like wind, hydro, and nuclear power. It is advantageous for corporations, new markets, and for consumers to get a stable price and continue purchases. I think this is a very solid idea and hits all important aspects in the economy.