And the best guesstimates of the costs of the other two programs
mentioned in the Subject header for this thread:

Skylab ~$10 billion in 2009 dollars
Mir ~$5 billion in 2009 dollars

Assuming that your $150 billion ISS cost is correct, the ISS is 30x
more expensive than Mir, and 15x more expensive than Skylab. (If ISS
costs are indeed closer to $100 billion, then Mir would be 20x and
Skylab 10x more affordable).

But, is the comparison to the older stations valid? The ISS is so
much larger and more capable, so that comparing the cost if the ISS to
the cost of Skylab is like comparing the cost of my van to the cost of
a bus. An interesting benchmark, perhaps, but not telling in and of
itself.


~Michael