Beginners treat cash as an absence: the space where investments aren't yet, an embarrassment to be minimized, evidence you haven't done your job. Great absolute-value investors treat cash as a position with its own return and its own option value, held deliberately when nothing clears the hurdle. Both views contain truth, and the mark of a mature investor is holding the tension honestly rather than dogmatically. What follows presents both sides in numbers, per the guardrails.
What is the case against holding cash?
The case against cash: drag. Cash earns the short-term rate; equities are expected to earn more (that spread is the equity risk premium, M3.02). Holding cash therefore has an expected cost, the cash drag. If equities are expected to return ~11% (INR nominal, illustrative) and cash yields ~6%, then holding 20% of the portfolio in cash costs, in expectation, 20% × (11% − 6%) = 1.0% per year of foregone return. That sounds small; compounded over a decade it is not. 1.011¹⁰ versus a fully-invested line means giving up roughly 10% of your terminal wealth to the drag. A serious price. And there is a behavioral trap layered on top: the evidence (and Bogle's lifelong argument) is that most investors who "go to cash" do so out of fear near bottoms and redeploy out of greed near tops, so their cash timing destroys value rather than adding it. For the average investor with no reliable edge, the honest conclusion is uncomfortable but real: stay invested; cash is usually a drag you inflict on yourself at the worst times.
Advertisement
What is the case for holding cash?
The case for cash: optionality and discipline. Now the other side, which is equally rigorous. Beyond being a low-returning asset, cash is a call option on every future opportunity, with no expiry and a strike price of "the best bargain that appears." Its value is invisible in calm markets and enormous in dislocated ones. Consider the dry-powder arithmetic: you hold 20% cash, and a market panic (2008, March 2020) lets you deploy it into your best idea at a 40% discount to its pre-panic price. That cash, put to work at the bottom, might compound at 20%+ from a trough valuation, and it is available precisely when everyone who was fully invested is a forced seller and cannot act. The option value of being the one buyer with capital in a panic can dwarf several years of drag. This is why Klarman and Marks hold cash not as a market-timing call but as the residual of a bottom-up process: when nothing clears the conservative-value bar, the disciplined output is cash, and lowering your standards just to be "fully invested" is how the institutional imperative (the pressure to always look busy) destroys returns. Buffett's famously large cash balances are the same logic: cash is what a patient opportunity-cost investor holds when the opportunity cost of every available idea exceeds its return.
How much cash should you hold?
Holding the tension. The synthesis is not a fixed cash percentage; it is a rule about how cash arises. Cash as a top-down macro bet ("I think the market will fall, so I'll sell to 50% cash") is market timing, is very hard to do well, and for most people is a drag-plus-behavioral-error machine. Avoid it. Cash as the bottom-up residual ("I hold 18% cash because, after applying my hurdle, only 82% of my capital is in ideas that clear it") is discipline, and it is defensible even though it drags in a rising market, because it is bought and sold by your valuation standards, not your market forecast. The practical policy most disciplined stock-pickers adopt: no cash target, no cash cap; cash is simply what's left when you refuse to lower your hurdle, with the honest acknowledgment that this will cost you return in long bull markets and pay you enormously in the rare panic, and that you must have the temperament to hold it through the former to be there for the latter. State your own cash policy in the mini-project, and be honest about which kind of investor you are: if you can't resist deploying cash near tops, a rule that keeps you closer to fully-invested may serve you better than one that hands you a market-timing lever you'll misuse.