Samsung forecast a 19-fold second-quarter profit jump yet saw shares drop 10%. Micron posted a 15-fold gain; its stock spiked to $1,240 then slid to $948 within two weeks. SK Hynix and Samsung each represent roughly 8% of the MSCI Emerging Markets index, while TSMC accounts for another 15% — meaning three highly correlated semiconductor giants dominate the benchmark.

The sector's cyclicality is stark. Micron's 15-year history shows optimal buying at troughs — February 2016 ($10), May 2019 ($32), December 2022 ($52) — when price-earnings ratios were infinite or elevated. Selling at peaks — May 2018 ($57), December 2021 ($91) — coincided with low P/E multiples. CEO Sanjay Mehrotra argues AI demand has broken the cycle; the market disagrees.

SK Hynix just raised $28bn via an ADR placement to fund massive new capacity, evoking memories of the 2005 flash-memory glut that crushed pricing. Micron's September year-end flatters its balance sheet by capturing post-holiday inventory lows, understating true leverage risk. In cyclical industries, debt amplifies both booms and busts.

The pivotal question: can AI hyperscalers generate revenue "enough to pay the bills" for this unprecedented capital expenditure? The market demands proof before extending further funding. The pattern echoes 2000 — portal stocks peaked, then network builders like Cisco led the next leg, then the cycle ended. Until AI monetization validates the build-out, memory-chip equities remain hostage to the same cycle that has defined them for decades.