Final answer:
The primary effect of travel problems includes socio-economic impacts such as disruptions to the labor force, supply chains, consumer behavior changes, and potential for market free-fall and military actions.
Step-by-step explanation:
The primary effect as people face travel problems, as discussed in the article 'Everybody Jump', is a range of socio-economic impacts. Disrupted travel not only affects how individuals connect and interact but also has larger implications on international investment levels, labor force skills, overall health, and supply chains. This can lead to widespread unemployment, a shift in consumer behavior such as a decrease in indoor dining and an increase in online shopping, and societal reliance on new communication technologies like Zoom.
Additionally, environmental conditions and the recession brought on by a global pandemic can prompt migrations for reasons beyond economics, including social issues like urban decay and the quest for better healthcare or educational opportunities. Societal challenges such as these can lead to significant changes in the landscape, as evidenced by men losing their jobs and becoming less visible in public spaces. The potential for market free-fall and stimulation of global military actions is also a concern that could result in more immediate and devastating effects than the gradual unfolding of climate change.