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It seems probable that popular space travel services can grow throughout 21st century much as air travel services grew during 20th century. Indeed, in view of the growth and globalization of the world economy and financial system over the past 100 years, it seems possible that while the air travel took about 100 years from its start in 1903 to reach a turnover of $1 trillion/year, space travel might reach that figure within 50 years

https://www.researchgate.net/publication...
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