Complete the correlation

1) Perfectly elastic demand : Ed = ∞ :: …………..: Ed = 0
Ans:- perfectly inelastic 

2) Rectangular hyperbola : …………..  ::  Steeper demand curve : Relatively inelastic demand.
Ans:- Unitary elastic

3) Straight line demand curve : Linear demand curve :: ………… : non-linear demand curve.
Ans:- demand curve is convex to the origin

4) Pen and ink : ……….. :: Tea and Coffee : Substitutes
Ans:- Complementary

5) Ratio method : Ed =  %△Q/%△P  :: ……………………. : Ed = Lower segment/ Upper segment
Ans:- Percentage change in quantity demanded/Percentage change in price