The Cambridge economist Piero Sraffa returned to the classical economic meaning of surplus, but his concept differs from Marx's in at least three important ways: (1) The substance of Sraffa's surplus is not a claim on the surplus labour of others but a physical surplus, i.e. the value of physical output less the value of physical inputs used up to produce it, in abstraction from price changes (roughly, like a standard valuation in national accounts); (2) The magnitude of the surplus in ...
, Dream Maker (2009-present) How long does mayonnaise last? How long does Miracle Whip last? Unopened mayonnaise will last at least a week beyond a best by date, erring on the safe side. The shelf life of mayonnaise regardless of such things as the sell by date, use by date, or best before date is not very long.
If you've left the whipping cream out for two hours or less, it may be fine to refrigerate and consume. In general, if dairy products like whipping cream have been at or above 40 degrees Fahrenheit for two hours or more, they should be considered unsafe to use.