A、It is a non-profit group located in Nairobi, Kenya. B、It works hard on replacing the national currency system. C、It introduced

At the Sifa Primary School outside Nairobi, Kenya, students pay their tuition with a new, local currency called the pesa. The school is one of several institutions that accept the community currency. The currency is widely used by people in the Gatina Village. The pesas are equal in value to the Kenyan shilling and can be spent in the community just like cash. The new currency gives poor people more buying power than they would otherwise have. If members of the community have a shortage of the national currency, they can use the community currency to get access to the goods and services they may need. The non-profit group Grassroots Economics introduced the currency here last year. Community currency programs are being set up by non-profit organizations across the world. They help poor communities increase trade and create jobs, according to Grassroots Economics, based in Mombasa, Kenya. "It does not replace but rather supplements the national currency system," reported the non-profit group.
3. What is the advantage of the pesa?
4. What can we learn about the Grassroots Economics?