If you put your book on the table it will not move on its own. what then will make it move?

the book will not move its own but it is removed by applying other external force

answer; i do believe that the correct answer is (punch card ballots);

no , per capita income is not a true measure of the development because: -it only tells us about average income not how income is distributed among the people.it only give us an idea of the economic aspect.it is only at the qualitative basis.moreover, income is not only the way of development other factors are also as much as important as income.