Imagine there is an island called 'ABC' where only 4 people reside, a farmer, a grocery seller, an idli-wallah and a Fertilizer manufacturer. The farmer sells rice, methi (fenugreek) seeds and urad dal to the grocery man. The grocery man converts rice into flour and sources some other materials like cooking oil from the neighbouring island. The idli-wallah buys this stuff from our grocerier and makes some delicious Idlis which are bought by the farmer for a fair price. Remember, there is one more person on this island, a Fertilizer manufacturer who had sold Fertilizer to the farmer. The grocery man sells extra fenugreek to the neighbouring island.
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