Discount-Rate Regime Lens
Read every asset class through the interest rate that prices it.
Asset valuation is dominated by the discount rate applied to future cash flows. In a zero-rate world, a dollar in 20 years is roughly worth a dollar today, which makes long-duration tech and Silicon Valley 'blitzscaling' businesses extremely valuable. In a higher-rate world, that same future dollar is sharply discounted and the same business is worth a fraction of its prior price.
The lens forces investors to ask: 'which regime is this valuation pricing?' A 100-year chart of rates shows current levels aren't actually high — they're normalised. Strategies built for ZIRP often quietly stop working when rates simply return to typical historical levels.
Applying the lens reframes growth vs value, public vs private, and Magnificent-Seven concentration as functions of the rate regime, not permanent truths.
- Future cash flows are only as valuable as the rate that discounts them.
- Growth equities are long-duration assets; value equities are short-duration.
- Today's rates aren't historically high — they're closer to normal.
- Strategies that worked in a falling-rate regime may stop working in a rising one.
- Over very long periods, growth and value tend to deliver similar returns.
- Plot rates on a 100-year chartAnchor your sense of 'high' and 'low' against multi-decade history rather than the last 10 years. The 'higher for longer' panic looks different against a century of data.
- Tag each holding by duration sensitivityGroup your positions by how far in the future their cash flows lie. Profitless tech and pre-revenue VC companies are extreme long-duration; mature dividend payers are short-duration.Pro tipUse a rough classification — short / medium / long duration — rather than over-engineering precise DCFs.
- Stress test against rate scenariosImagine rates 2-3% higher than today's level for several years. Which holdings would be most damaged? That tells you your concentration of regime risk, regardless of business quality.WarningStrategies that compounded for 15 years in falling rates carry the largest hidden regime risk.
- Rebalance toward overlooked durationsIf you're nervous about a toppy market, consider rotating toward overlooked value and short-duration assets rather than going to cash. They were never inflated, so they shouldn't deflate the same way.
- Re-test long-run style performanceUse long history (50-100 years) to remember that growth and value tend to deliver similar returns over very long periods, even though one will dominate for stretches.
Boyle notes that essentially all the post-credit-crunch equity gains have come from a handful of US tech stocks (formerly FAANG, now Magnificent Seven). British and European stocks have done very little in the same period.
Companies like the Uber-clone delivery apps grew on cheap capital and stock price appreciation, not cash flow. Tesla pay packages exceeded the company's lifetime cumulative earnings — a structure only sustainable in a zero-rate world.
Boyle's video 'Blitzscaling' explored companies that grow by raising capital and ignoring profits — a business model that depends on cheap money. He notes growth has outperformed value for 15-20 years, but warns that long stretches don't mean either approach is permanently better; both have historically averaged similar returns. The implication: the rate regime, not stock-picking skill, often explains the dominant style.