によって Edwin Goh Duo Yao 12年前.
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In Singapore, all goods and services are charged with a tax of 7% currently (also known as GST). This would similiarly apply to our yoghurt ice cream which is indirect taxation to consumers. However, since yoghurt ice cream is known to be healthy and beneficial for one's health, the government may subsidize the production of this good, thus directly lowering the cost of production for our yoghurt stall.
Choice here is between career choices after A levels examinations. Out of the 2, only one can be chosen, hence explaining choice where among the possible alternatives, the best has to be chosen. In which, to set up a yogurt ice cream stall is a choice over going to university in this case.