Principles of economics with taxation and agrarian reform a modular approach per Azarcon, Ernie Roy S., Marzo, Rosario Marfori, Navarro, Gladys Marquez, Resureccion, Lorence M., Paca, Eleonor D., Degay, Imelda Paragas, Carino, Michelle S., Rojo, Elaine Geraldine, Papay, Martin B., Jr, Sison, Nicetas Paragas