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The Case for and Against Buffer Stocks

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Evaluate the case for and against using a buffer stock scheme to stabilise the price of a commodity such as sugar or tin.

A buffer stock scheme is an intervention carried out by the government which aims to limit fluctuations in the price of a commodity. But is it the best way to stabilise the price of a commodity like sugar or tin?
Consider what would happen if there was no intervention in a commodity market, such as sugar:

In the diagram, the Supply for Year 1 is S, which gives a Price of P and Quantity of Q. This is deemed by the government to provide a price which is fair to both consumers and producers and an adequate supply of the commodity.
In Year 2 there is a bumper harvest (shown as S2 on the diagram). Without a buffer stock system then price will fall to P2 and Quantity rises to Q2. This could present a problem to producers, who may consider P2 is too low a price for their commodity.
In Year 3 there is a poor harvest (shown as S3 on the diagram). Without a buffer stock system then price will rise to P3 and Quantity fall to Q3. Also, P3 could be deemed an unfair price for consumers to pay by the government.
The buffer stock system works by minimising fluctuations in the supply of a commodity to help to stabilise price. When there is a good harvest, the government can choose to buy and store the excess supply (Q-Q2). This will keep the price at P and Quantity at Q. However, if there is a bad harvest, the excess commodity from Year 2 can be used to boost supply from S3 to S, increasing the Quantity from Q3 to Q and lowering the price from P3 to P.
The advantages of this system are that it will keep the output relatively stable. This will prevent food shortages which would otherwise occur for example in Year 3. This situation could be disastrous if a harvest is particularly bad as serious food shortages could be a major risk to health. Also, it will

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