Ib Economics Hl Formula Booklet – Confirmed

The booklet gives PED as negative (since price and quantity move inversely). Yet every year, students drop the negative sign when calculating revenue changes. Tip: Keep the negative; then interpret the absolute value.

%ΔQdA%ΔPBthe fraction with numerator % cap delta cap Q sub d cap A end-sub and denominator % cap delta cap P sub cap B end-fraction : ib economics hl formula booklet