What specifically has made mass tourism possible and opened up access to the market?

Question

Quizplus · Accepted Answer

Space-time convergence, meaning the reduction in time and cost of travel due to advances in transportation and communication technology, has made mass tourism possible and opened up access to the market. The other options may have contributed to the growth of mass tourism, but without space-time convergence, it may not have been possible on the same scale.

What Specifically Has Made Mass Tourism Possible and Opened Up