Ungepita tu kimya kimya, PPP ndo kipimo cha living standards za watu kwenye nchi. A country with higher PPP is richer than a country with lower PPP and higher per capita because in exchange rates goods are relatively cheap in a country with higher PPP than a country with lower PPP.
To put it in a way you can understand, if Kenya has 2$ PPP and Tz has 4$ this means Tanzania can buy as twice with their money what Kenya can buy once with their money regardless of per capita.
Nyuzi kama hizi upite tu mdau kama una mapovu, its humiliating lecturing you.