The Mars bar used to often be a benchmark to compare pricing. The Mars bar price tended to vary with inflation and was therefore a good item to gauge relative prices.
Today we are running out of noughts to use for some of the news items about the trillions of pounds of debt our nation and banks have. So along has come a new measure to help us: the Tesco.
Using the Tesco as a standard unit (about £60bn) then:
Read all about this use of Tescos at the BBC website. A new definition of Tesco’s value?