Final answer:
Price adjustment is the term used to describe decreases or increases in sales prices based on market conditions and comparable sales data.
Step-by-step explanation:
The decreases or increases in sales prices, rendered in dollar amounts or percentages, that reflect a property's value based on comparable sales is called Price adjustment. Price adjustment is a term commonly used in the real estate industry to describe changes made to the sales price of a property based on market conditions and comparable sales data.