Changes in earnings yield versus bond yield affect Indian equity valuations mainly through the equity risk premium and the discount rate used in valuing future cash flows.

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1. Key concepts in the Indian context

- Earnings Yield (EY)

- EY = Earnings per share (EPS) / Price per share = 1 / P/E

- For the market, investors often look at Nifty 50 or Sensex earnings yield.

- Higher EY (lower P/E) means you are getting more earnings for every rupee invested.

- Bond Yield (BY)

- Usually proxied by the 10-year Government of India (G-Sec) yield as the risk‑free (or near risk-free) rate in rupees.

- Also influenced by RBI policy rates, inflation expectations, fiscal deficit, and global yields.

- Equity Risk Premium (ERP)

- ERP ≈ Earnings Yield – Risk‑free Yield (simplified; in practice it’s expected return on equity – risk‑free).

- This is what investors demand over and above G-Sec returns for taking equity risk.

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2. How the relationship drives long-term valuations

A. When earnings yield is high relative to bond yields (EY >> BY)

- Implication

- ERP is high; equities offer significantly more earnings relative to risk‑free returns.

- Market is generally cheap relative to bonds.

- Impact on long-term valuations

- Over time, this tends to support:

- P/E expansion (prices rising faster than earnings) as investors rotate from bonds to equities.

- Higher total returns as starting valuations are attractive.

- Long-term investors are willing to accept a lower future ERP as valuations re-rate upwards.

- Typical macro backdrop in India

- Often seen after:

- Sharp equity corrections (equity prices fall, EY jumps).

- Or when RBI cuts rates but equity prices have not yet fully re-rated.

- Example (illustrative only)

- Nifty earnings yield: 8%

- 10-yr G-Sec yield: 6%

- Simple ERP proxy ≈ 2%

- If risk appetite improves and G-Sec stays at 6%, investors could bid up equities until EY falls (e.g., to 6.5–7%), i.e., P/E rises.

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B. When earnings yield is low relative to bond yields (EY << BY)

- Implication

- ERP is compressed; you are not being paid much extra over G-Secs to hold equities.

- Market is generally expensive relative to bonds.

- Impact on long-term valuations

- Increases vulnerability to:

- P/E de-rating if bond yields rise further or earnings disappoint.

- Lower forward returns from equities over a 5–10 year horizon.

- Even if earnings grow, the multiple may compress, offsetting EPS growth.

- Typical macro backdrop in India

- Occurs when:

- RBI is in a hiking cycle, G-Sec yields are rising, but equity valuations remain rich.

- Or when global liquidity is abundant and P/Es have run ahead of domestic fundamentals.

- Example (illustrative only)

- Nifty earnings yield: 4.5% (implied P/E ~22x)

- 10-yr G-Sec yield: 7.0%

- EY < BY → simple ERP proxy negative or near zero.

- Any further move up in G-Sec yields or downward revision in earnings can trigger P/E compression.

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C. When both earnings yield and bond yields fall

- If bond yields fall faster than EY

- Real ERP can actually improve even if absolute EY declines.

- DCF models: lower discount rates → higher present value of future earnings; equity valuations can rise.

- If EY compresses more than bond yields

- ERP shrinks; valuations may become stretched, even if rates are low.

- Long-term returns then depend heavily on sustained high earnings growth.

- Common Indian scenario

- Post-rate-cut or easing cycles:

- G-Sec yields move down.

- Equities re-rate (P/E increases, EY falls).

- Whether this is sustainable depends on future earnings growth.

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D. When both earnings yield and bond yields rise

- Usually a tightening environment

- RBI raising rates, inflation concerns, global yields moving up.

- Bond yields rise → higher discount rate.

- Impact on valuations

- Higher bond yields directly pressure P/Es (DCF effect).

- If EY also rises, it usually means prices are correcting faster than earnings are falling, or earnings expectations are poor.

- Outcome: P/E de-rating and lower valuations until a new equilibrium ERP is established.

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3. Mechanics in valuation models

1. Discount rate (Cost of Equity in India)

- Ke ≈ Risk‑free (10-yr G-Sec) + Beta × ERP + Country/other risk premia

- Higher G-Sec yields or lower ERP → higher Ke → lower present value of cash flows → lower justified P/E.

2. Relative yield comparison (“Fed model” style)

- Investors compare EY vs G-Sec yield.

- If EY – G-Sec is:

- High and stable: room for multiple expansion.

- Low or negative: signals overvaluation vs bonds; more downside risk.

3. Sectoral effects

- Rate-sensitive sectors (banks, NBFCs, real estate, autos):

- More sensitive to G-Sec/yield moves via funding costs and demand.

- Secular growth/quality names:

- Can sustain higher P/Es and lower EY for longer if earnings visibility is strong, but are still vulnerable to sharp de-ratings when bond yields spike.

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4. Long-term equity returns versus the EY–BY relationship

Over long horizons in India (10+ years), broad patterns generally hold:

- Starting periods with high EY vs G-Sec have historically been followed by:

- Better equity returns,

- Some degree of P/E expansion,

- Outperformance vs long-duration bonds.

- Starting periods with low EY vs G-Sec have often led to:

- Below-average equity returns,

- Valuation de-rating risk,

- At times, better risk-adjusted outcomes from G-Secs or a balanced allocation.

These are tendencies, not guarantees; actual outcomes always depend on realized earnings growth, inflation path, policy, and global conditions.

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5. Practical interpretation (for analysis, not advice)

- If bond yields rise but earnings yield does not adjust upwards (P/E stays high), the market becomes richer relative to bonds, and the implied long-term expected equity return declines.

- If bond yields fall and equities have not yet re-rated, the market may be undervalued relative to bonds, and a higher P/E can be justified by lower discount rates.

- For long-term Indian equity valuation work, tracking the spread between Nifty earnings yield and 10‑yr G-Sec yield is a simple but powerful sanity check on whether the market is broadly cheap, fair, or expensive relative to fixed income.

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