Impacts on Rental Markets and the Relative Usefulness of Elasticity Concepts
Answer
Two forces operate across these markets: slowing income growth (a demand-side change whose effect depends on the income elasticity of demand) and rising maintenance costs (a supply-side change). Their net effect on each market’s price, quantity and total revenue depends on the relative sizes of the demand and supply shifts and on the relevant elasticities. The thesis is that YED is the most useful concept here, because it alone differentiates the markets, while the supply-side change is common to all.
High-end watch rental market (YED > 1, PED > 1)
A high-end watch rental is a luxury good (YED > 1), so even slowing — but positive — income growth raises demand, reinforced by the favourable shift in tastes toward subscription consumption; demand shifts right strongly. Rising maintenance costs raise the cost of provision, lowering supply. Since the demand increase is large and outweighs the supply fall, equilibrium price rises and quantity rises. With PED > 1 for this market, the larger quantity sustains a rise in total revenue.
Budget furniture rental market (0 < YED < 1, 0 < PED < 1)
Budget furniture rental is a necessity-like normal good with low YED (0 < YED < 1), so slowing income growth raises demand only modestly, with a small further rise from changing tastes. Rising maintenance costs lower supply. If supply falls by more than demand rises, equilibrium price rises and — depending on the relative shifts — quantity may rise or fall. The point is that the demand response here is far weaker than in the watch market, because YED is low.
Related market — derived demand for timber
The shift toward rented budget furniture reduces demand for non-rental furniture, and hence — through derived demand — for the timber used to make it. Demand for timber falls, lowering its price, quantity traded and total revenue. (Equally, the non-rental high-end watch market, a substitute for the rental version, sees demand pulled down both by the switch to renting and by the higher price of rentals, so its outcome is ambiguous depending on the relative shifts.)
Assessment of the usefulness of elasticity concepts
YED is the most useful concept in this scenario. The supply-side shock — higher maintenance costs — is broadly common across the rental markets, so it does not distinguish their outcomes. What distinguishes them is the direction and magnitude of the demand shift in response to slowing income, which YED governs: a large rise for the luxury watch rental (YED > 1), a small rise for budget furniture (low YED), and — if the slowdown deepens into recession — a possible fall in demand for any good that becomes relatively inferior. A profit-maximising producer would therefore monitor income forecasts closely and adjust its product range accordingly — diversifying toward inferior goods if recession looms — making YED the single most decisive concept.
The other elasticities matter but less. PED determines whether the resulting price change raises or lowers total revenue, so it is essential for predicting revenue but is downstream of the demand shift YED drives. XED explains the spillovers to substitute (non-rental) and derived (timber) markets, but only conditions the size of secondary effects.
Judgement. Elasticity concepts are jointly indispensable for analysing these interlinked markets, but they are not equally useful. YED is the most useful because it alone explains why the markets diverge under a common income shock — the central question — while PED and XED refine the revenue and spillover implications. For the decision-maker (a profit-maximising producer), the practical priority is therefore to read the income-growth outlook through the lens of YED, then use PED and XED to fine-tune the revenue and product-mix response.