I.e. if there are 100 cement trucks in the economy and 95 are allocated for state projects, the private sector needs to produce additional cement trucks under the increased burden of taxation. In the near term, cement construction costs have been increased. From this point, perhaps another bureau will enter by nationalizing the cement truck industry, "To secure our vital national interests and remain competitive"
Without decentralized market price signals, we are unable to value the end goals of the state's construction project. More troubling still, we wouldn't know of how the market may have allocated those trucks or if those trucks would have been used in a more productive way. However, we can observe empirical historical examples of lowered productivity which correlates with central planning.