appreciation
An increase in the value of something over time.
depreciation
A decrease in the value of something over time.
market value
What something could be sold for today.
percent appreciation or depreciation
(new value − original value) ÷ original value × 100%. A negative result means depreciation.
asset
Something you own that has value, such as a car, a home, savings or shares.
negative equity
When you owe more on a loan than the item is worth. Also called being "underwater" on a loan.