One of the most popular posts of this blog (as far as resonance goes) was the one on Scaling the Price of Margarine. Today, I did the family weekend shopping and noticed I have to update the calculation:
At our local Rewe branch, they offer the pound of Lätta for 88 cents while they ask 1.19Euro for half the pound. With the ansatz from the old post, this means the price for the actual margarine is now -9,78Euro/kg. This, by coincidence is approximately also the price you have to pay to get rid of waste oil.