Beta in gold trading

Beta is the slope of one asset’s returns against another’s. A beta of 1.5 to gold means that, on average, when gold moves 1% the asset moves 1.5% in the same direction. Beta is estimated from historical data over a chosen window and, like correlation, it changes. Where correlation says how reliably two assets move together, beta says how much.

How it applies to gold trading

Gold traders meet beta mainly through silver and gold mining stocks. Silver typically has a beta well above 1 to gold, which is why silver rallies and falls are larger in percentage terms; the gold/silver ratio moves as a result. Gold miners historically carry an even higher beta to the metal because their costs are fixed and their profits swing with the price. A trader who wants more exposure to a gold move sometimes takes it in silver or miners; a trader who wants less takes it in gold itself.

Gold’s own beta to equity markets is usually low or slightly negative, part of its appeal as a diversifier, though in sharp liquidations gold can be sold alongside everything else.

Position sizing across metals should use current volatility rather than beta alone: a silver trade sized to the same dollar risk as a gold trade will usually need fewer ounces because its daily range in percentage terms is larger.

A common mistake

Treating a historical beta as fixed and sizing a silver trade as “1.5 gold trades” without checking current volatility. Betas estimated in calm periods understate what happens in a crisis.

See also: Correlation, Gold/silver ratio, Volatility, Gold ETF.

Frequently asked questions