Moreover, many things are not required throughout the year, but only at a specific time.

For example, the households, subsidized households, patrols, and scribes needed for tax collection in summer and autumn are only routinely needed when taxes are collected in summer and autumn, and it is usually impossible to support so many people.

For another example, the folkmen and firewood workers needed in winter, the gatekeepers, dammen, and shallow husbandmen needed when the river thaws in spring, are even a small number of manpower needed in specific seasons, and sometimes they are not even needed in specific seasons. For example, there is enough firewood for warmth in winter. , or there is too little snowmelt in spring, and the dam does not need extra manpower to guard it.