There will always be ineffeciencies that can be made effecient. Humans built this new world full of tools, by solving the problems.
We invented wheel to move easily, fire to keep ourselves warm and agriculture to solve the problem of food. So we are evolved problem solvers.
If we look carefully there will always be problems that needs to be solved. Pick a problem if it is not solved previously, then it would be a good idea to build a solution for it.