Growth investing focuses on companies with above-average revenue growth, expanding total addressable markets, and durable competitive advantages that allow sustained above-average earnings growth for 5-10+ years. The canonical growth investor thesis: if a company can grow earnings at 25% annually for 10 years, today's 40× P/E is a bargain compared to the future earnings multiple that will apply at full maturity. Growth investors accept high current valuations in exchange for the compounding power of high sustained earnings growth.

The risk in pure growth investing is multiple compression: when earnings growth decelerates (as it inevitably does for every company), the premium multiple collapses. A stock that earned $2.00 at a 50× P/E ($100 price) that slows from 30% to 10% growth might re-rate to a 25× P/E — even if earnings grow to $3.00, the stock falls to $75.00. This is the growth trap: the multiple changes faster than the earnings growth can compensate. Understanding whether growth is durable and defensible is the core analytical challenge of growth investing.

Value investing, rooted in Benjamin Graham's work and later refined by Warren Buffett, focuses on buying businesses at prices significantly below their intrinsic value — creating a 'margin of safety' that protects against analytical errors and adverse outcomes. Graham's original formulation focused on quantitative screens for cheap stocks (low P/E, low P/B, strong balance sheets). Buffett extended the framework to include qualitative competitive moat analysis — a company can be statistically cheap and still a poor investment if it has no durable advantage.

Value stocks by definition have been poor recent performers — that's what makes them cheap. Investors extrapolate recent underperformance too far, creating mispricings. The value investor's edge is mean-reversion in both business fundamentals (temporary cyclical difficulties often reverse) and market sentiment (pessimism that depresses multiples eventually fades as fundamentals recover). The empirical value premium — documented in Fama and French's extensive historical research — shows cheap stocks (low P/B) have historically outperformed expensive stocks by roughly 3-4% annually over long periods.

Growth and value are not binary — they sit on a spectrum, and the distinction is somewhat artificial. A business growing at 15% annually with strong returns on capital and a reasonable 20× P/E is simultaneously a growth stock and a value stock by most definitions. The quality factor — high profitability, strong balance sheets, sustainable competitive advantages — bridges the two philosophies. Warren Buffett's famous evolution from 'cigar butt' (deep value) to 'wonderful company at a fair price' reflects the integration of growth durability into a value framework.

Market regimes create periods of growth or value dominance. Growth outperformed dramatically in the low-rate environment of 2010-2020 when long-duration cash flows were discounted at near-zero rates. Value outperformed strongly in 2022 when rate rises compressed long-duration growth multiples. Rather than abandoning either approach based on recent performance, institutional investors maintain multi-factor exposure that includes both growth and value characteristics — seeking companies that are growing above-average rates while trading at reasonable prices relative to that growth (the GARP — Growth At a Reasonable Price — approach).