The Shiller P/E Is Broken, And You Need To Stop Reasoning In Fiat Terms

The S&P 500’s headline P/E of about 29x looks expensive, but adjusting for stock-based compensation, R&D capitalization, and intangible amortization lowers it to roughly 22–23x. That still leaves valuations above long-run averages, but far below dotcom-bubble extremes. The article’s message is mainly interpretive and valuation-focused rather than a catalyst-driven market event.

Analysis

The key implication is not that equities are cheap, but that the market’s valuation premium is partly a capital-allocation premium. Firms with high stock comp, heavy R&D, and large intangibles are being penalized by legacy accounting even when those costs are economically productive, which helps explain why the index can look structurally expensive while still supporting durable earnings power. That backdrop favors businesses that can convert “expensed growth” into later margin expansion, and it makes straight P/E comparisons less useful than free-cash-flow yield and cohort-level retention metrics.

Second-order, this is a relative valuation tailwind for software, internet, and platform names versus capital-intensive or asset-heavy sectors that do not benefit as much from the accounting reset. If investors begin to accept a higher sustainable multiple for the index, the first beneficiaries are likely the highest-quality compounders with visible R&D payback, while lower-quality duration trades may lag because they have the same accounting optics without the same economic moat. A broader re-rating also helps index-level passive flows, but only if rates stay contained; a backup in real yields would quickly reassert the old multiple framework.

The contrarian view is that the market may already be implicitly applying this adjusted lens, so the bigger mistake would be assuming the “new P/E” justifies further multiple expansion from here. If margin pressure, wage inflation, or weaker demand causes the economic return on R&D to extend, then the adjusted multiple becomes a trap rather than a clarification. The durability of the thesis is a months-to-years story, but the next catalyst is probably earnings season: any slowdown in buybacks or deterioration in operating leverage would expose how much of the premium is still liquidity-driven rather than fundamentals-driven.

Key Decisions for Investors

• Stay long QQQ / short XLU or XLP as a 3-6 month relative-value expression: the adjusted accounting lens supports secular growers more than defensive cash-flow names if rates remain stable; cut if real yields reprice higher.
• Buy calls on MSFT or AMZN on earnings pullbacks, targeting 2-3 quarters: these names are best positioned to monetize capitalized intangibles and convert R&D intensity into operating leverage; risk is multiple compression if guidance shows slower payback.
• Pair long IGV / short IWM for 1-2 quarters: software should benefit most from the market’s willingness to capitalize growth expenditures, while small caps remain more exposed to financing costs and weaker balance-sheet quality.
• Avoid paying up for low-quality “cheap” cyclicals with no R&D or intangible advantage: if the market is migrating to economic earnings, apparent low P/E names can become value traps over the next 6-12 months.
• If positioning for a macro hedge, use SPY put spreads rather than outright shorts: the index is not bubble-cheap, but the adjusted framework reduces the odds of a near-term valuation unwind unless earnings or rates break.