Portfolio: Allocation, diversification, and keeping what you earn

Portfolio construction is the part of investing where decisions compound quietly for decades, and this category treats it with that weight. It opens with asset allocation — the split between equities, fixed income, cash, and alternatives — and the evidence that this single choice explains most of the variation in a portfolio’s return path. Risk tolerance is separated from risk capacity: what you can emotionally hold through a 40% drawdown is a different question from what your time horizon and cash needs actually permit, and the lessons treat both as inputs rather than treating one as a proxy for the other.

Diversification is covered properly rather than as a slogan. You will learn why owning thirty stocks in the same sector is concentration wearing a disguise, how correlation between holdings determines whether adding a position reduces risk at all, and why correlations across risk assets tend to converge toward one during the exact drawdowns diversification was meant to cushion. Position limits, concentration risk, and the specific danger of holding employer stock alongside employer income are given their own lessons. The index-versus-individual-stocks debate is presented with the actual cost arithmetic: expense ratios, tracking error, turnover, and the difficulty of persistent outperformance after fees.

Rebalancing has a long run of articles, covering calendar-based against threshold-based approaches, the tax cost of rebalancing in a taxable account, and rebalancing with new contributions to avoid realising gains at all. Alongside it sits the measurement material: standard deviation, beta, maximum drawdown, the Sharpe and Sortino ratios, and why time-weighted and money-weighted returns can differ sharply for the same account. Dollar-cost averaging is compared honestly against lump-sum investing rather than assumed to be superior.

Tax treatment is where most of the recoverable value sits, and the category covers it in detail: traditional against Roth accounts, contribution and income limits, employer matching, asset location — placing tax-inefficient holdings inside sheltered accounts and tax-efficient ones outside — tax-loss harvesting and the wash sale rule that constrains it, and the long-term capital gains thresholds that reward patience directly. The final group addresses the decumulation phase: safe withdrawal rates and the research behind them, sequence-of-returns risk in the first years of retirement, required minimum distributions, and how a portfolio built for accumulation should be restructured once it has to produce income.