The basics of the original Phillips Curve

The essence of the Phillips Curve is that there exists a short-term trade-off between
unemployment and price inflation

Why might there be a trade-off?
In 1958 AW Phillips from whom the Phillips Curve takes its name plotted 95 years of
data of UK wage inflation against unemployment.
It seemed to suggest a short-run trade-off between unemployment and inflation.
The theory behind this was fairly straightforward- falling unemployment might cause
rising inflation and a fall in inflation might only be possible by allowing unemployment to

Therefore If Government wanted to reduce the unemployment rate, it could increase
aggregate demand but, although this might temporarily increase employment, it could
also have inflationary implications in both the labour and the product markets.