Positive externalities -
This happens when production and/or consumption create third party benefits outside of the market
Positive production example
Projects to reduce deforestation
Bee keeping and pollination
Positive consumption example
Pest control and gardening
Youth clubs and apprenticeships
The social benefit is higher than the private benefit
A subsidy educes the mpc of consumption and ought to lead to an expansion of demand towards the desired social optimum
Because there are poitive externalites in production, MSC if production is less than the MPC of production