That is one of the things that modern and better ways of doing things in an efficient manner has actually brought,the jobs that many persons would have ordinarily do,it will take one machine to do it.every job today started out as a way to reduce labor costs and is therefore a example of technological unemployment. Quick and easy answer is bulldozers and backhoes-they have eliminated thousands of jobs that used to be done with men and shovels-and most of the men are now doing something else but for those who did not learn new things they are out of luck.