In equity valuation, when is the 'Price-to-Sales' (P/S) Ratio particularly useful compared to the P/E Ratio?

[ A ]When valuing cyclical companies with temporary negative net earnings (losses) or early-stage high-growth firms that have robust revenue growth but have not yet achieved net profitability.[ CORRECT ]

[ B ]When valuing sovereign government treasury bills.

[ C ]When valuing companies that have zero revenue and zero customers.

[ D ]When P/E ratios are above 1,000 in real estate trusts.

Takeaway

The P/S ratio is particularly useful for valuing cyclical companies with temporary losses or early-stage high-growth firms with strong revenue but not yet net profits, because it doesn't require positive earnings to compute.

Derivation

P/E Ratio is undefined or meaningless when a company's net earnings are negative or near zero, which is common for young growth companies still scaling toward profitability or cyclical businesses in a temporary downturn. Price-to-Sales instead uses revenue — a figure that stays positive even when net income doesn't — as the denominator, letting analysts still compare relative valuation across peer companies even when P/E breaks down. This makes P/S a complementary, not a replacement, metric: it says nothing about profitability or margins, only about how the market is pricing each rupee of top-line revenue, which is the nuance the exam is testing.

Why the others fail

B — When valuing sovereign government treasury bills.

Sovereign treasury bills are fixed-income discount instruments valued using yield-to-maturity mechanics; equity valuation multiples like P/S have no application to them.

C — When valuing companies that have zero revenue and zero customers.

P/S is mathematically undefined for firms with zero revenue, since the ratio requires a positive sales figure in the denominator — it cannot be applied to pre-revenue companies.

D — When P/E ratios are above 1,000 in real estate trusts.

Very high P/E ratios in REITs relate to a different valuation distortion; P/S's specific advantage is handling negative or near-zero earnings, not exceptionally elevated P/E multiples.