In theory, liquidity is often defined in transactional terms: the ability to convert an asset into cash quickly, at or near fair value. But in portfolio construction and behavioural finance, liquidity is far more complex. It is not simply a structural feature; it is a psychological comfort, a source of optionality, a latent cost and crucially, a strategic decision.
Most individuals gravitate towards liquidity almost reflexively. The assurance that one’s capital is always within reach fosters a sense of control, or at least, the appearance of it. But this immediacy comes at a price. Liquid instruments typically exhibit lower yields, precisely because the flexibility they offer is already priced in. They are also subject to continuous market repricing, which introduces not only volatility but behavioural risk. The investor’s challenge often isn’t volatility itself but also how they respond to it.
We return to Jana and David, two fictional profiles introduced in our previous piece, to illustrate how liquidity decisions play out in practice.
Jana once equated liquidity with prudence. Her portfolio was composed of money market funds, daily priced unit trusts, and listed equities, assets that offered transparency and mobility. But over time, this access became a liability. Real-time mark-to-market valuations created persistent tension. In drawdowns, she moved to cash. When the market recovered, her capital was still watching from the sidelines.
David took a more intentional approach. He didn’t reject liquidity, but he segmented it. His portfolio held layers of access, liquid assets for known near-term needs, semi-liquid positions for opportunistic rebalancing, and illiquid strategies for long-duration goals. He wasn’t chasing yield for its own sake. Rather, he was aligning access to purpose. The result was a portfolio less exposed to market noise and better tuned to his actual life, not just his tolerance for movement.
Ultimately, liquidity is a trade-off and must be weighed in the context of purpose, time horizon, and emotional discipline. Like leverage or duration, it can amplify outcomes, both good and bad. The investor’s task is not simply to maximise access, but to understand when, and why, it is truly needed, and to design around that answer with intention.