Why Investing is Vital: Debunking "Cash is King"

The economic dynamics of cash

Why invest at all, if your goal is simply to preserve what you have? The phrase “cash is king” suggests that holding money is the safe choice. That view falls apart once you look at how modern money works.

Currencies were once anchored to a commodity such as gold. In a crisis, wealth holders hoarded gold, its price rose and the prices of goods and services fell. Capital stopped flowing into businesses, ideas and production, a liquidity trap in which existing wealth gained while the real economy stalled. Most economies moved away from the gold standard and adopted inflation targeting instead.

In most developed economies the target inflation rate is around 2%. Unproductive cash therefore loses about 2% of its purchasing power each year. Over a decade, a million dollars held in cash is worth roughly eight hundred thousand in real terms. Over fifty years it falls below four hundred thousand, assuming it earns nothing and none of it is spent.

Central banks, which control the supply of money, make cash inflationary by design. Inflation is, in effect, a tax on unproductive capital.

What idle cash costs a UAE resident

There is a particular complacency that comes with living in the UAE. A growing balance in a banking app, with no income tax taken from it, feels like progress. But a dirham sitting in a current account that pays close to nothing still loses purchasing power whenever prices rise. Because the dirham is pegged to the US dollar, its value moves with US monetary conditions, and when global and local prices climb, that cash buys less each year.

Many residents also wait until they have accumulated a large sum before seeking advice. The cost of that delay is the compounding that never happens: every year of waiting is a year of returns on returns that cannot be recovered later.

How to mitigate the inflation tax

The answer lies in owning businesses, that is, equities. Sovereign wealth funds, pension funds and other long-term institutional investors typically hold a large share of their capital in equities for this reason. When you own a company, you own a portion of its continuing production of goods and services. Your income is not a fixed cash amount but the value of that production as it is sold. As prices rise with inflation, so does the value of what the business sells, which is why equities have served as a long-run hedge against inflation.

Put simply: owning eggs is one thing; owning the farm that produces them is another. A wheat farm pays its owner in wheat, a building pays in rent, a company pays in the profits from what it sells. None of those returns is denominated in a fixed amount of dollars or dirhams.

We all have long-term goals, which are in effect future liabilities. If those liabilities are long-dated, our assets should be managed accordingly. Investing is therefore about more than preserving value against inflation: it is about making sure you can meet future goals and building an income stream that can be reinvested if you do not need it yet.

How much cash should you hold?

Cash is not king in wealth management, but it is necessary. An emergency fund of around six months of expenses gives you a reliable safety net. That, together with enough cash to cover spending you can foresee over the next few years, is sufficient for most people. For larger expenses, such as an asset purchase or starting a business, hold investments liquid enough to bridge the gap.

A practical way to organise this is in three tiers, so that every dirham has a defined job:

Where the cash tier lives matters too. Our comparison of savings accounts, fixed deposits and money market funds and our guide to holding savings in AED or USD cover the options for UAE residents.

Alternatives to cash, and their limits

Bonds and sukuk. Instead of holding cash, you can lend to governments or companies through bonds, or through sukuk, their Shariah-compliant equivalent. You receive regular payments and lock in a rate for a set period. The return is fixed in currency, though, so it remains exposed to inflation, and it is only as secure as the issuer’s ability to repay. Our framework on lending from the viewpoint of an individual explains the trade-offs.

Gold, Bitcoin and other non-productive assets. Gold has long been seen as a haven in unstable times. But gold produces no income, and there is no assurance that a given quantity today will cover a specific future cost, such as medical expenses or retirement. Since the world moved off the gold standard, goods and services have been priced in currencies such as the US dollar. The dollar is not an excellent store of value either, because inflation is by design. Durable wealth comes from owning productive assets that generate returns irrespective of currency or gold prices. Prioritise productive assets such as equities over non-productive ones such as gold and Bitcoin, and treat the latter as a supporting allocation rather than the core. Diversification still matters throughout.

Understanding high-yield cash deposits

When short-term interest rates are high, as they were when US policy rates passed 5% in 2023, cash can look productive. But rates rose that far precisely because inflation had overshot its target. Periods in which short-term rates comfortably exceed inflation tend not to last.

Cash also carries reinvestment risk. It tells you what you will earn over the coming months, not over the coming decade. You might enjoy a high yield this year, then see rates fall and lose the return you were counting on. If a high rate appeals, consider locking it in for longer through a bond.

Bear in mind that both cash (short-term lending) and bonds (medium to long-term lending) promise fixed returns in currency, which makes them vulnerable to inflation. Productive real assets, chiefly equities, deliver returns in goods and services whose value rises with inflation.

Staying invested through uncertainty

Tariffs, deglobalisation and geopolitical shifts periodically add uncertainty to markets, and in those moments cash can feel like the sensible place to wait. Market swings are normal. When the news is unsettling, it helps to remember that you are planning for decades, not days. Staying calm, focusing on fundamentals and keeping a diversified mix of investments leaves you better prepared than moving to cash and trying to judge when to return.

Conclusion

Cash is necessary for daily transactions and emergencies. Relying on it, or on other non-productive assets, for long-term wealth undermines both preservation and growth. Investing protects wealth against inflation, can generate passive income, and positions you to meet future goals.

“Cash is king” should not mean hoarding cash. It should mean holding just enough liquidity to manage risks and seize opportunities, while the rest of your assets work for you. For the cash you do hold, a transparent account such as SmartCash keeps it earning; for the rest, Vault’s investment portfolios put it to work in a diversified, global portfolio.

History makes the point clearly. The chart below compares a decade of returns from different assets, all adjusted for inflation.

Sources: Equity is represented by the S&P 500 Index; real estate by the S&P CoreLogic Case-Shiller 20-City Composite Home Price NSA Index; gold by the S&P GSCI Gold; inflation adjustment uses the Consumer Price Index (CPI), Bureau of Labor Statistics. Past performance is not indicative of future results.