Passive, cap-weighted fixed income funds behave like momentum traders, buying more of a bond as its price rises. This is a flawed strategy for fixed income because many bonds are callable, meaning their upside is capped and rising prices increase call risk. Active management can exploit this inefficiency.

The primary appeal of a bond ladder isn't trying to time interest rate changes, but the sense of control it provides. Investors value the ability to let bonds mature and receive cash back without being forced to reinvest, offering certainty and command over their portfolio's evolution.

This concept quantifies a reasonable time horizon for any asset, including stocks, by measuring its sequence of returns risk. It allows financial planners to build institutional-style, liability-driven portfolios for individuals by matching assets to specific future goals.

Unlike a market-cap-weighted stock index driven by competition, an aggregate bond index is dominated by the largest issuer: the U.S. government. The index mechanically buys whatever debt the government issues, regardless of duration risk or investor interests.

In bond investing, where upside is capped at a promised return, superior performance comes from what you exclude, not what you buy. The primary task is to eliminate the bonds that will default. Once those are removed, all the remaining performing bonds deliver a similar, contractually-fixed return.

BlackRock's CIO of Global Fixed Income argues that unlike equities, fixed income is about consistently getting paid back. The optimal strategy is broad diversification—tilting odds slightly in your favor and repeating it—rather than making concentrated, high-conviction "bravado" bets on specific market segments.

While a 100-year bond from a tech company like Google seems precarious, its risk profile is not dramatically different from a standard 30-year bond from a bond math perspective (duration). Such an issuance is often driven by 'reverse inquiry' from specific investors like pension funds seeking to match their long-dated liabilities.

Future bond returns are highly predictable. The current yield on a 10-year bond provides a reliable forecast of its annualized return over the next decade. This is because capital gains from falling rates are offset by lower reinvestment yields, and capital losses from rising rates are offset by higher yields.

A key advantage of using defined-maturity bond ETFs is immense diversification. A single ETF representing one 'rung' of a ladder can hold hundreds of individual bonds, a level of risk mitigation that is practically impossible for most investors to achieve when buying individual bonds, especially with limited capital.