Are you really that dumb? Your money "frozen" in raw materials (from which you make goods that you later sell) earns you revenue. And as long as it is above inflation, you are still making profits by any means.
So, for you, if you need for $ 10 000 000 of material during a year, or you only need $1000 of material during a year, if in the end you sell for $200 more than the expenses you did a year before, you made a benefice of $200 ?
As I told you, good luck with your business
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By the way, your "risk free interest rate" is actually below inflation. For example, inflation in the US was 1.6% for 2014, while 1 yr US treasury bonds yielded only about 0.25% the same year, so you are obviously dancing upon nothing...
This simply means that the real risk-less interest rate was negative. There is so much demand to place money, and there is so little demand to borrow money, that people even want to pay for others to keep their money. This is a real possibility when there is inflation: that you are willing to PAY for people to borrow your money, because you can attenuate somewhat the loss of value due to inflation.