A clean quantitative framing is this: asset location is where most taxable investors leave the biggest free improvement on the table. Mechanism: Different asset classes generate different kinds of taxable income. Placing high-tax assets in tax-sheltered accounts and low-tax assets in taxable accounts can meaningfully change after-tax outcomes. It costs nothing to reorganize location, and the compounding effect over decades can rival good security selection. Market translation: Bonds generating ordinary income often belong inside an IRA while long-term equity positions can sit in a taxable account at lower capital gains rates. Failure mode: The mistake is treating all accounts as one pool and ignoring the tax character of each return stream. Review question: Write down the state variable you would monitor first if this thesis started to drift. The point is not to memorize the label. The point is to know what variable is actually doing the work.