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Recessions, depressions, and crashes are an inherent part of market capitalism. This means that during these depressions, productive forces go unused and production sharply decreases. Planned economies can deliver consistent economic growth, and have done.
Communist countries with economic planning are authoritarian and repressive (like north korea) which reduces "general welfare"
Information technology and increased computational power allows for the collection of information on a mass scale, as well as the ability to compute an economic plan in a short period of time, automatically.
All developments in planned economies are guaranteed to be in the interest of the majority of people, and will promote their general welfare first of all.
In capitalism, if someone fancies themselves good at planning, they can start a business and we'll see. in socialism, which is what you probably mean by economic planning, they just have to grab the government.
States presiding over capitalist market economies can only crudely wield macroeconomic tools to solve very fine societal problems.
States involved in economic planning can vastly reduce poverty, homelessness, and unemployment through directly allocating resources.
Unemployment is an inherent part of capitalism. Full employment is at best only temporary, meaning that market capitalist economies are always Pareto inefficient. Socialist planned economies can guarantee work for all, meaning that all available labour is utilised.
Economic planning has historically lead to stagnation and no growth. Countries using economic planning had higher rates of poverty than market economies.