I think everyone else is misunderstanding your point. You're saying someone should quantify the additional dangers and costs to society associated with an incre

I think everyone else is misunderstanding your point. You're saying someone should quantify the additional dangers and costs to society associated with an increase in carry-on luggage which happened at the same time airlines started charging for checked bags. So now that checked bags cost money, people bring more and larger carry-on luggage. This additional carry-on luggage: 1. increases boarding times. 2. increases injuries from passengers and flight attendants lifing heavy bags into overhead compartments. 3. increases the amount of crowding on a cabin from under seat carry-ons thus increasing evacuation times.