What it means
Beta measures how much an asset moves relative to a market benchmark. A beta of 1 means the asset moves in lockstep with the market. Beta of 1.5 means it moves 50% more than the market on average - both up and down. Negative beta is rare and usually a hedge.
Why it matters
Beta is the cleanest decomposition of market risk. It separates 'I'm taking generic equity risk' from 'I'm taking idiosyncratic risk in this specific stock.' Capital allocation decisions live or die by this distinction.
How to use it
Use beta to size positions. A high-beta stock at the same dollar allocation has more market exposure than a low-beta stock - that's not what most retail investors think they're doing.
Want a worked example or a deeper dive? Ask Rocky how this concept applies to your specific watchlist or trade idea.
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