According to Keynes, businesses will strongly weigh macroeconomic externality when deciding how much investment spending to make. Economy of Zambezi, hypothetical nation, is running at its potential and seeking to increase output levels. When a good or service is produced or consumed in an economy, externalities happen,
when those actions have effect on party that is not directly investment in those activities. When the production or consumption of a particular good or service has an impact on third party who 's not directly connected to production or consumption of that good or service, it is often considered be technical externality.
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