Gold Standard 2.0：爲什麼回到金本位制不現實？

Gold has always been the ultimate store of value—from ancient Lydia's first gold coins around 550 BCE to the monarchs who hoarded it for centuries. But here's the twist: despite its historical prestige, the idea of returning to a gold standard today is running into some hard math.

The Classic Gold Standard Problem

Back in theory, the gold standard was beautiful—trade imbalances would self-correct automatically through the price-specie flow mechanism that David Hume described. Surplus countries would see inflation, deficit countries would see deflation, and markets would rebalance. Sounds elegant, but reality was messier. The 1907 Panic showed how rigid the system was: when the US faced a banking crisis with no central bank to act as lender of last resort, the gold standard's inflexibility left policymakers handcuffed. That crisis directly led to the Federal Reserve's creation in 1913.

Then came WWI. Nations suspended gold convertibility to fund war efforts. What was supposed to be temporary became permanent chaos in the 1920s—some countries deflated (like Britain), others devalued (like France), and the imbalances triggered mass unemployment and eventually the Great Depression.

The Math That Kills the Dream

Let's talk numbers. As of June 2025, the monetary supply of the world's four largest central banks (US, EU, Japan, China) hit approximately $95 trillion. How much physical gold could back that?

Total above-ground gold: 216,265 metric tons (end of 2024) Value at $3,000/oz: ~$23 trillion

That's a gap of $72 trillion. Even worse: 45% of the world's gold sits in jewelry, and only 14% (~$4 trillion) is in central bank vaults. There simply isn't enough gold on Earth to underpin modern monetary supply.

The US already hit this wall in 1971 when Nixon suspended dollar-to-gold convertibility. The dollar was overvalued, reserves were depleted, and Bretton Woods collapsed. To return today would require either massive deflation or devaluation—both economic disasters that would hurt borrowers, farmers, and anyone with debt.

Will BRICS Save It?

Some analysts like Jim Rickards have floated the idea that BRICS nations are quietly building a gold-backed reserve currency (China's been bulk-buying gold, after all). Sounds intriguing, but most serious analysts dismiss it. Jeffrey Christian from CPM Group called the idea nonsensical back in 2023—and the numbers back him up. Even if BRICS wanted to try, the same math problem applies: not enough gold exists.

The Real Tension

Here's what makes this debate persistent: the gold standard eliminated runaway inflation (that's good), but it also crushed debtors and suppressed growth (that's bad). You trade inflation volatility for deflation-driven unemployment.

Today's system—where central banks manage inflation within a target range—is imperfect but more flexible. The cost? You're exposed to inflation risk if policymakers mess up (like post-COVID). The benefit? You can actually respond to crises without watching the financial system seize up.

Bottom line: Gold is great as a hedge and store of value. As a hard anchor for $95 trillion in global money supply? The world doesn't have enough of it, and the economy can't absorb the shock of trying.