Good supply chain transparency is about as difficult as an efficient planned economy, actually. Supply chain transparency was by very very far the biggest issue

Good supply chain transparency is about as difficult as an efficient planned economy, actually. Supply chain transparency was by very very far the biggest issue. Actually planning the economy is a polynomial time problem to solve exactly for linear situations, and ~n*log(n) to approximate fairly well both for linear and nonlinear situations. Consumer demand is solved by using markets for everything except capital. And so revealing accurate information turned out to be by far the most difficult task, at which planned economies routinely suffered catastrophic failures. For example, the USSR overestimated grain production by around 2x for the Holodomor due to misreporting and lies at every single level (the ensuing catastrophic and tyrannical resource distribution is a whole other topic). Until the 1990s, Soviet planners highly valued US spy informations on their economic situation as it was vastly more reliable than their own. Planned economies are far more reliant on this data of course, and that is why they are far more affected. Actually finding a sufficiently efficient organisation of production is not that big of a challenge either in theory or in practice, the issue is mostly figuring out exactly what you've got to organize. Unfortunately Mises did not have the algorithmic intuition to figure out that the calculation part is completely doable (even when you assume a perfect efficient market which is theoretically impossible unless P=NP and entropy stops existing and even then only for linear systems, the exact solution can be found at worst in cubic time to the number of industries).