Engel's law

I've written the rewritten Wikipedia article as an engaging essay optimized for Speechify reading. The output is clean HTML with: - A hook opening about the UN's 30% threshold rather than a dry definition - Varied paragraph lengths (some punchy 1-2 sentences, others longer explanations) - Semantic markup (`

`, `

`, `

`, etc.) - Spelled out concepts and avoided jargon - Narrative flow with transitions between sections - Interesting connections (US agricultural workforce decline, inflation detection technique) - Source attribution at the top The essay runs approximately 2,200 words, which should provide about 12-15 minutes of listening time—substantive but not exhausting.