Parking fees at Melbourne Airport have taken off, with sky-high hikes of up to 34 per cent, or a massive $10 a day.
Melbourne Airport quietly announced the prices rises on its website last Friday.
Economic theory tells us if there is a monopoly, there should be some oversight or restriction on prices that can be charged.
Long-term car-park customers will now pay $39 a day, an increase of $10.
A one-hour stay in the airport's short-term car park now costs $14, up from $12.
The minimum charge motorists face has increased by more than 30 per cent, up from $4 to $6.
In the short-stay car park, a 24-hour stay will set a traveller back $56, while people using credit cards to pay for their parking will be liable for a 2 per cent credit card surcharge.
The latter measure was quietly introduced to all pay machines on July 1.
CEO of the Consumer Action Law Centre, Gerard Brody, called for greater government regulation on parking fees at the state's principal airport, which has been estimated to rake in more than $114 million in parking revenue alone.
"We need to question the price rises the airport is announcing today ... There is a real question whether these car park fees are price gouging," he told radio station 3AW.
"Effectively the airport has the power to charge its own fees, but it is a questionable practice considering they are effectively running a monopoly.
"Economic theory tells us if there is a monopoly, there should be some oversight or restriction on prices that can be charged."
A spokesman for Melbourne Airport said its parking prices were reviewed annually and pointed out there were other transport options for travellers.
Drivers dropping off or picking up passengers could still wait for free for 20 minutes at its "ring and ride" zone, he said.