How Roman Central Planners Destroyed Their Economy

How Roman Central Planners Destroyed Their Economy | Foundation for Economic Education:
"In 449 B.C., the Roman government passed the Law of the Twelve Tables, regulating much of commercial, social, and family life.
Some of these laws were reasonable and consistent with an economy of contract and commerce; others prescribed gruesome punishments and assigned cruel powers and privileges given to some.
Other regulations fixed a maximum rate of interest on loans of approximately 8 percent.
The Roman government also had the habit of periodically forgiving all interest owed in the society; that is, it legally freed private debtors from having to pay back interest due to private creditors.
In 45 B.C., Julius Caesar discovered that almost one-third of the Roman citizenry was receiving their grain supply for free from the State.
The Roman government also set price controls on wheat. 
In the fourth century, B.C., the Roman government would buy grain during periods of shortages and sell it at a price fixed far below the market price.
In 58 B.C., this was improved upon; the government gave grain away to the citizens of Rome at a zero price, that is, for free.
The result was inevitable: farmers left the land and flocked to Rome; this, of course, only made the problem worse, since with fewer farmers on the land in the territories surrounding Rome, less grain than before was being grown and brought to the market.
Also, masters were freeing their slaves and placing the financial burden for feeding them on the Roman government at that zero price.
To deal with the financial cost of these supplies of wheat, the Roman government resorted to debasement of the currency, that is, inflation. 
Pricing-fixing of grain, shortages of supply, rising budgetary problems for the Roman government, monetary debasement and resulting worsening price inflation were a continual occurrence through long periods of Roman history."
...Finally, as, again, Ludwig von Mises concluded, the Roman Empire began to weaken and decay because it lacked the ideas and ideology that are necessary to build upon and safeguard a free and prosperous society: a philosophy of individual rights and free markets.
As Mises ended his own reflections on the civilizations of the ancient world:
“The marvelous civilization of antiquity perished because it did not adjust its moral code and its legal system to the requirements of the market economy. 
A social order is doomed if the actions which its normal functioning requires are rejected by the standards of morality, are declared illegal by the laws of the country, and are prosecuted as criminal by the courts and the police. 
The Roman Empire crumbled to dust because it lacked the spirit of [classical] liberalism and free enterprise. 
The policy of interventionism and its political corollary, the Fuhrer principle, decomposed the mighty empire as they will by necessity always disintegrate and destroy any social entity.”