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The price premium is what you are willing to pay, extra, to buy local or buy moral or both. Unless it is very strongly positively correlated to the score, the score is wrong, and must be fixed. In other words, the score is just a generalized, abstracted, price premium.
The end user at the point of purchase decides what that number is, and must translate it into a currency and map it onto the price, to see which buying option makes the most sense.