Nvidia is now bigger than Japan. In the MSCI All Country World Index, the global benchmark that ~85% of cross-border equity money tracks, one American chip company just edged past the world's third-largest stock market. Nvidia at 4.96%. Japan at 4.94%. Three years ago, Nvidia was 1% of this index. The line went vertical in 2024 and never broke stride. The number sounds small until you understand ACWI. The index covers 23 developed markets, 24 emerging markets, roughly 3,000 stocks. Every $1…