In the film industry, much is like a lottery. Often, directors and producers place huge bets on their creations, only for them to fail. They don't achieve audience love or substantial fees. But sometimes the opposite happens. This was the case with George Miller's action film “Mad Max” (1979).
About $350,000 was spent on production (equivalent to approximately $1.8 million in 2020). Mere pennies for Hollywood, even at that time. But the creators simply didn't have more money. Miller was a doctor by education and financed the film with his hard-earned money.

Source:
imdb.com
The cars were taken almost from the junkyard. These were old wrecks that had to be patched up and brought to proper condition. All the motorcycles on the set were given to Miller for free. During filming, they were smashed to pieces.

$15,000 of the film's budget had to be paid to the 24-year-old Mel Gibson for his work. But all expenses were recouped in the first days of “Mad Max” being shown on the big screen. By 1982, the total worldwide box office gross was $100 million.
