The ACA Didn’t Just Expand Coverage — It Rewired Incentives

Part 1 of 3 on an informative discussion regarding healthcare

Most healthcare debates focus on intentions: help more people, protect the vulnerable, stop abuse. The Affordable Care Act (ACA) clearly pursued those goals. But healthcare systems aren’t driven by intentions. They’re driven by incentives.

And when the ACA changed how prices, risk, and payments work, behavior across the entire system changed with it.

Take the little-discussed 3:1 age-rating rule, which limits how much more insurers can charge older adults than younger ones. It sounds fair. But healthcare costs don’t rise gradually with age — they rise steeply. The difference didn’t disappear. It was shifted.

Younger, healthier people were charged more than their risk justified. Older people paid less than theirs. That cross-subsidy was intentional. The predictable result? Many young, healthy individuals opted out of coverage, weakening the risk pool and pushing premiums higher for those who stayed.

This wasn’t a failure of execution. It was a design tradeoff.

The same logic applies to insurer profit caps. When profits are limited to a percentage of premiums, higher spending leads to higher dollar profits. Reducing total costs can actually reduce an insurer’s allowed profit. Over time, this nudges insurers away from aggressive cost reduction and toward managing networks, billing rules, and regulatory complexity instead.

None of this requires bad actors. The system responds rationally to the rules it’s given.

The ACA improved access for millions, but it also dulled the incentives that normally restrain costs. When rules redistribute risk, cap margins in percentage terms, and mute price sensitivity, higher spending becomes easier — even expected.

Understanding that doesn’t require opposing the ACA. It requires acknowledging that policy design shapes outcomes, whether we intend it to or not.