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When tractors were first developed, they used enormous steam engines that were notoriously unreliable and hard to maintain. These were phased out around the turn with the twentieth century and substituted for internal combustion engines which were smaller though powerful and ran on a number of fuels including kerosene, ethanol and gasoline. By the 1960s several of these engines were phased out and only more effective internal combustion engines that ran on diesel and after this, biodiesel. As any first-year econ student will advise you, there's 2 disciplines in economics - microeconomics and macroeconomics. And they don't like the other. As the U.S. Congress prepares to lower the hammer for the financial services industry, consider the forces which are butting heads and why it is just seeing that they've thought we would do this. Microeconomics may be the area that business students gravitate towards. Profit maximization could be the mantra, with marginal costs and fixed costs optimized to generate businesses as much money as possible. Microeconomics compares the world with the eyes of the CEO, who looks to accomplish what's best for his company - bring in more money and deliver value.