Well, bhalo, for percentage method, you see how much demand changes when price changes a little—like when I raised biscuit packets by five rupees and sales fell by ten percent. For total expenditure method, you watch if total customer spending goes up or down after the price change. But you know, in my tiny shop, regulars buy the same amount of Marie biscuits regardless of price, so this "elasticity" often feels less real. Every evening I see that loyalty matters more than calculation, isn't it?
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