The government, rather than the free market, determines what goods should be produced, how much should be produced and the price at which the goods are offered for sale.<span>
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Sales tax is regressive, the second is progressive, and the third is proportional.
Car accelerates whenever its velocity is changed by either changing the speed or the direction of the car's motion. So, even if you are driving your car at a constant speed while turning around a corner, you are still accelerating.