The governments of the world are grappling with Covid 19 pandemic, several measures are being implemented, namely, sanitizing, social distancing, hand-washing, working from home or online and various forms of Lockdowns. The hope of all nations is to vaccinate at least 70% of the population to reach head-immunity. This is based on Scientific advice, that once that population percentage is immunized, the whole population would be protected, Economist call this positive externality in consumption. With suitable diagrams, illustrate and discuss the phenomenon highlighted above.

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The governments of the world are grappling with Covid 19 pandemic,
several measures are being implemented, namely, sanitizing, social
distancing, hand-washing, working from home or online and various
forms of Lockdowns. The hope of all nations is to vaccinate at least
70% of the population to reach head-immunity. This is based on
Scientific advice, that once that population percentage is immunized,
the whole population would be protected, Economist call this positive
externality in consumption. With suitable diagrams, illustrate and
discuss the phenomenon highlighted above.

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