What is the origin of ethiopian calendar

The Ethiopian schedule is a sun based schedule which thus gets from the Egyptian schedule, yet like the Julian schedule, it includes a jump day like clockwork no matter what, and starts the year on August 29 or August 30 in the Julian schedule.

maybe by travelers or gossip

the correct answer is “opportunity cost”. opportunity cost is what a company misses out because it decided in one option over another one. in this case, the company decided to invest in building a factory so it gave up another possible benefit or profit in order to achieve success with the factory.  

trade-off is not the correct answer since it is a situation in which you accept losing something in return for benefits in other areas.

and finally, consequence is a general term used to accept what it comes when you make a decision. it can be a positive or negative consequence depending if the decision you took was the correct one.