I was watching a YouTube video the other day that compared Marvel movies and it was shocking how much the production costs have gone up.
The cost to make them has gone up about $100 million across the board.
$150 million for an older Marvel movie compared to $250 million for a new one seemed about average. That $100 million difference happened over about 5 years.
The average cost of an MCU movie is $200M.
The 3rd, 6th, and 7th movies (out of 30) were already hitting $200. Gaurdians (the 10th movie) cost $232. So, the idea that the first batch of MCU movies were $100M cheaper is false.
And the average over all is artificially higher because of the spectacles of the Avenger movies, which are unsurprisingly more costly.
The first batch of MCU movies that weren't hitting $200 were in the $140-$175 range. It would be very inaccurate to say that the current batch of movies is $100 more than that. Ant-Man & the Wasp, Far From Home, and Shang-Chi were all made in that same range.