Bull Markets vs Bear Markets

The conventional definition of a bear market is a 20% or greater decline from the prior peak, and a bull market is a 20%+ advance from the prior trough. These thresholds are practically useful as communication shorthand, but they are technically arbitrary -- a 19.9% decline is not fundamentally different from a 20.1% decline. The more meaningful distinction is the underlying economic and monetary environment: bull markets are sustained by earnings growth, accommodative monetary policy, and expanding credit conditions; bear markets are driven by earnings contraction, tightening conditions, or the unwinding of excess leverage.

Within the secular bull/bear framework, cyclical markets exist. A secular bull market (like the 1982-2000 period or 2009-2022 in the US) contains multiple cyclical corrections of 10-20% that do not represent regime change. A secular bear market (like the 1966-1982 inflation period or the 2000-2009 valuation/credit unwind) can contain powerful multi-year bull rallies that seduce investors into thinking the trend has changed. Distinguishing cyclical from secular regime shifts requires analysis of valuations, credit conditions, demographic trends, and monetary policy stance -- the one-dimensional 'up or down' framing is insufficient.

Bear markets have historically averaged 9-12 months in duration and 30-35% in depth for the median case. But the distribution is fat-tailed: the 2000-2002 bear produced a 78% Nasdaq decline; the 1929-1932 bear fell 89% at its trough. The Great Recession bear lasted 17 months peak to trough. Sizing strategy to the average bear while ignoring the tail risks means your plan fails precisely in the most consequential scenarios.

Correlations rise in bear markets. Assets that were diversifying each other in the bull -- domestic equities, international equities, high-yield bonds, commodities -- tend to converge toward 1.0 when panic selling dominates and investors liquidate whatever they can rather than whatever they want to. This is the 'all correlations go to 1 in a crisis' phenomenon that makes historically calculated diversification benefits disappear precisely when they are most needed. The only assets that reliably provide bear-market cushion are long-duration government bonds (in deflationary recessions), cash, and gold.

Volatility regimes flip. In bull markets, low-volatility periods can persist for months -- realized volatility on the S&P 500 below 10% is common in advancing markets. In bear markets, daily 2-3% moves become routine, weekly 5-10% swings occur regularly, and realized volatility commonly reaches 40-50% annualized. Strategies sized for bull-market volatility become radically over-exposed when the regime shifts. This is why sophisticated risk managers size positions to volatility rather than to dollar amounts -- the same number of shares represents a very different risk when the stock is moving 1% per day versus 4% per day.

The 'don't fight the Fed' principle has historically been one of the most reliable regime signals. Equity bear markets have rarely ended before the Federal Reserve shifted from tightening to easing. This is not because the Fed causes recoveries directly, but because monetary easing reduces discount rates (raising equity valuations), reduces borrowing costs (improving business profitability and credit availability), and signals that policymakers are willing to support the economy. Investors who monitor Fed policy stance rather than trying to predict economic turning points directly have a more lead-time-adequate framework for regime transition.

No one reliably and consistently calls market turning points in advance. The honest admission that market timing is largely futile is not a counsel of passivity -- it is an invitation to build portfolios that are more regime-aware rather than regime-dependent. This means maintaining a level of equity exposure you can actually hold through a 30-40% drawdown without panic-selling, using trailing stop disciplines on individual positions to limit single-stock damage, and keeping a cash buffer that allows you to add selectively during dislocations rather than being forced to sell into them.

Sector behavior changes predictably across regimes. Late-cycle, just before and during the early stages of a bear market, defensive sectors (utilities, consumer staples, healthcare) tend to outperform. Financials lead recoveries as credit conditions normalize. Technology and consumer discretionary outperform in mid-to-late bull markets as earnings growth accelerates and risk appetite expands. These patterns are not perfectly consistent but have been reproducible enough across multiple cycles to justify a sector rotation overlay in regime-aware portfolio construction.