Imagine you have a bunch of workers who are building a giant sandcastle on the beach. Overall labor effectiveness means how well these workers are doing their job and how much work they are able to finish in a certain amount of time.
Let's say that you have 10 workers and they have 8 hours to build the sandcastle. If these workers are working really hard and are able to complete the sandcastle before the 8 hours are up, then they are said to have high overall labor effectiveness.
On the other hand, if these workers are goofing off and not working as hard as they should be, then they are not being very effective. This means that they will have a harder time finishing the sandcastle within the given time limit, and their overall labor effectiveness will be low.
Overall labor effectiveness is important because it helps us understand how well workers are doing their job, and whether they are being productive or not. When workers are effective, they are able to get more things done in less time, which is good for everyone involved.