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With the liberalisation of transport, it is now the transport operators who decide on the place of ports and airports. The major evolution: new competition between these infrastructures. The market for these infrastructures, which is "hetero-determined", is the result of spontaneous liberalisation, and competition takes place both for and within this market. The law has reacted to this economic phenomenon by dismantling state monopolies through privatization or decentralization and by restructuring the infrastructure.