I see three main themes in the book as a whole:
1. Income effects are more important than substitution effects.
2. Expectations matter.
3. The private and social returns to liquidity are very different.
#1 (as applied to macro) and #3 were most original in his time. The book as a whole circles around these themes and repeats them in varying combinations, not always coherently or consistently. You could also add the claims that 4. monetary factors render a "natural rate of interest" problematic and 5. labor markets are special. Chapter two is essentially about #1 and #5.
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