and what are the differences? which one is the best?
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According to Adam Smith the government shouldn't be involved in the economy. The government should have rule of law that has no way of predicting winners or losers.
Galbraith believed that the government should be active in the economy, that in particular the government should spend lots of money on infrastructure and education.
Galbraith believed that when the business cycle moved up the government should compress its growth and when the cycle falls it should bump it back up (lower highs and higher lows).