From the shinto perspective, why do humans need to undergo frequent acts and rites of purification

He believes that evil things are the consequences because of an evil spirit, therefore, he believes that prayer and rituals to kami prevent from this evil spirit

Explanation:

According to Shinto, the human being needs to be good from the heart.  it is the first thing that every parent taught to their children i.e to be humble and pure from the heart. He believes that evil things are the consequences because of an evil spirit, therefore, he believes that prayer and rituals to kami prevent from this evil spirit

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.

saving account is right