Probably analogous to command economy? Basically all industry is centrally planned, so it’s not company A decides it wants to make some widget and company b decides they want to use company A’s widget in their new product that they’ve independently decided to make. The government says we need <product> which needs <widget>, thus company A shall make <widget> and company B will use <widget> to make <product>.

This is by no means an accurate representation of the whole system or an opinion on either, but just to give a simple idea of the difference.