Extrapolation
Using an established trend (from historical data or a line of best fit) to forecast future values by extending the trend...
Real World
During the 2019 UK housing boom, estate agents extrapolated rising house prices to forecast 2022 values — only for the market to stall following interest rate rises, illustrating the method's key limitation.
Exam Focus
Always evaluate extrapolation by stating one reason the trend may not continue — this is the most common mark-scheme requirement.
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