Why did justinian i fail to regain all of the formerly provinces of the old roman empire

As we all known that Justinian's attempts to restore peace and stability in the territory of the Byzantine Empire turned into cruelty and bloodshed.

Therefore, the restoration of the Roman Empire required huge sums of money, and the people could not bear the constant taxes on military expenditures. Captured territories resisted politics of Byzantium, there constantly erupted uprisings. The historical development of the country cannot be stopped or rotated at will. It is impossible to return the old orders, especially without the support of the local population.

a.) a poor farmer, due to the fact that they would want to be freed from british rule.

when a country suffers, for example, a drought period, the market product is affected for a low offer, in this case, potatoes; the government has to tax to the households, which have to give more money for the potatoes which they consume, that situation make them consume substitute goods even through loans, it could increase the financial market movement and the inflationary phenomena, the business has to increase salaries in order to the employees could buy a more expensive food (potatoes) and in order to inflation tha business had to buy expensive supplies in the factor market, while the rest of the world have to gain more money to consume the same amount of potatoes.