What are Interventionist Strategies, and why were they Popular in the Past?

-Interventionist Strategies, which are Similar to Inward Looking Strategies, use Import Substitution, Subsidies and High Exchange Rates. -They may also use Nationalisation, and Forcing Producers to Sell Goods Government ran Distributions to Keep Prices Down -They were Popular in the Past because of the 'Dependency Theory' claiming that Developing Nations are held back due to the Exploitation they received from Richer ones. -When they were used, there were problems with Economic Growth, Balance of Payments, Government Deficits, Corruption and thus Inefficiency -But there are still some Strategies from Interventionist Popular today! like Boosting Education or Healthcare or allowing Joint Ventures between Global and Local Firms/Governments