What was the usual cause of slavery in the ancient world

The cause of slavery was because of farmland, farmers could own a slave and not give the slave any salary. The slaves work for free.

ayatollah khomeini can best be described as the leader who declared iran to be an islamic republic.

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.