Construction workers, manufacturing workers, and farmers have what in common

Explanation:

Construction, manufacturing and farming workers have one thing in common, that they have to wait for the result of their input. They start from scratch, add up things on their journey, and wait to see the results. Construction workers start from the mapping of the building, start to build the building from base to top and then a full fledged building is constructed. Similarly, manufacturing workers start from inputting the raw materials, put their efforts in it and after that get their final end product. Again, farmers sow the seeds, take care of their fields, put their efforts, give water and spray pesticides, and then wait for the seeds to grow into fruits or vegetables whatever they have sewed. So all three workers have this thing common that they will have to wait for the output of their input.  

happiness is the correct luck

explanation: