Bert hamminga The Keynesian Multiplier    Control Questions

1. Keynes proved an interesting theorem, from only one assumption. Which theorem? Which assumption?
2. Is the assumption plausible?
3. If the assumption is true, does that mean the theorem holds?
4. Can the assumption, according to Tinbergen, be tested? How?
5. Can the assumption, according to Keynes, be tested? How?