Which was the first country in the world to start planned development?

the onlt thing i found is Singapore

Explanation:

The new town planning concept was introduced into Singapore with the building of the first New Town, Queenstown, from July 1952 to 1973 by the country's public housing authority, the Housing and Development Board.

what are the events?

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.