You have to understand that there isn't a real connection between "raw prime material" and "final product". Take a look at any produced material. (lets say bread).
The baker has to pay his employees, he has to pay for the flour, he has to pay the bills for the shop, he has to pay for the gas or electricity for the oven.
The 5% increase in flour (cereal based products usually) isn't related that the bread price went up a 50%. Specially during inflationary economies, where all "Costs factors" tend to increase simultaneously; so is flour goes up by 10%, energy costst 5%, renting goes up by 15%; it doesn't necessarily mean that bread will cost 30% more, it could go even as 100%.
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