Fix corrupted dollar signs in chapter 4 healthcare examples #11
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This PR fixes corrupted dollar sign formatting in the healthcare cost examples that were preventing proper display.
The Issue
The chapter 4 examples had malformed dollar amounts that wouldn't render correctly:
Before:

Problems:
The Fix
After:

Improvements
Context
This appears in "The Cancer Boom" section where the argument is that GDP perversely treats illness as economic good news. The dollar amounts needed to display correctly to show the shocking scale of how healthcare costs boost GDP metrics.
Small but important fix for professional presentation of key data.