Each player has $1500 to start a game of 'Monopoly.' According to the official rules, this includes two of the $500, $100 and $50 bills each. Each player also.
On the maps that show the ownership of streets and stations, the prices are stated, such as rent without buildings, and rent on buildings. It is also indicated on the map what the cost of the street is and what the street can provide as a 'mortgage'. You can borrow money from the bank in the form of a 'mortgage'. This is only possible on individual streets in an unbuilt series of streets in the same place. The interest that people pay with 'repayment' is 10%. Houses on built-up streets that are sold to the bank yield 50% of the original value. If you 'end up in prison' you can buy 'free' again under certain conditions.
The official rules state that players are not allowed to borrow money from each other. The player who has no more money loses. The player with the most money at the end is the winner.