What is ZIRP?
ZIRP (Zero Interest Rate Phenomenon) describes the post-2008 monetary regime in which major developed-economy central banks held policy interest rates at or near zero: the US Federal Reserve from December 2008 through 2015, then again from March 2020 through March 2022; the ECB and Bank of Japan for even longer. ZIRP is the established abbreviation for zero interest-rate policy; “phenomenon” is an informal later reading of the acronym.
The ZIRP-era tech bull market
ZIRP catalysed an extended bull market in venture-backed tech: discount rates near zero make far-future cash flows worth more in present-value terms, supporting elevated price-to-revenue and price-to-future-earnings ratios. Public tech multiples expanded from 4-6× revenue (pre-ZIRP norm) to 15-25× (peak ZIRP). Private valuations followed with lag: late-stage rounds at USD 10B+ became routine in 2020-2021.
The “ZIRP company” diagnostic
Mid-2022 saw widespread re-evaluation of “ZIRP companies”: startups whose growth model depended on cheap-capital-funded acquisition that worked only when capital was free. Characteristic ZIRP-company traits: 200%+ ARR growth on negative contribution margin, heavy paid marketing dependence, USD 200K+ revenue per employee but USD 250K+ burn per employee, USD 500M+ valuation at USD 30M ARR. As rates rose, these companies faced existential reset.
End of ZIRP and venture impact
The Fed Funds target range rose from 0 to 0.25% (before March 2022) to 5.25 to 5.5% (July 2023). Venture funding contracted ~50% from 2021 peak. Many ZIRP-era companies struggled or failed: Convoy shut down in 2023 and Hopin sold off its businesses in 2023 and 2024. Surviving companies pivoted to contribution-margin focus, capital efficiency, and durable acquisition economics.
Implications for current founders
Post-ZIRP, venture pitches must demonstrate path to capital-efficient growth: clear contribution-margin trajectory, less paid-CAC dependence, longer runway expectations. Pure growth-at-any-cost no longer works. The new template: efficient growth with clear unit economics, dry powder awareness in fund construction, and rate-sensitive scenario planning.
Related: Dry Powder, Hard Landing, Soft Landing, Contribution Margin.