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# How does cost affect revenue and profitability?

There could be a variety of answers to this question, depending on what perspectives you use to answer them. ( accounting, Economics etc ). Using my understanding of Economics, it's important to first have an equation to link all these variables. Profit = Revenue - Cost. This is called the profit equation, where profit equals revenue minus cost. Revenue is the sales that you obtain from day to day sales. It's expressed in a monetary value. For example, if I am able to sell 10 hotdogs today at US dollar 5 for each hotdog, then my revenue for the day will be US Dollars 50. However this is my revenue and not my profit, as I incurred cost while earning this revenue. Lets say the cost of this business is US Dollars 3. If this is the case the profit will be 50 - 3 which equals 47. Hence profit is 47. This equation shows that an increase in cost, can reduce the profit. At some instances, the increase in cost can increase revenue, depending on the price that you are selling and also the quantity sold. This will depend on how large the increase is. Generally if Revenue is more than cost, there is profit, while if Cost is more than revenue that is lost. If Revenue equals Cost, there is break even. This means that the profit is zero. Hope this helps. (cheong@bgymail.gd.cn)