Contributor(s): Professor Mary S Morgan | While the conventional view is that ideas create policy change and economic change follows on - it is just not that simple. We can see what is involved by looking at major changes - such as the reconstruction of post-war economies, post-colonial economic development planning, or switching from capitalist to socialist systems. Designing such new kinds of worlds required new ways of thinking about how the economic world could work involving imagination and cognitive work, and new kinds of economic measurements and accounting systems to deliver that change.