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Efficiency: well-used
sustainability: property of being sustained
trade off: pagsuko sa ibang mga ninanais upang makamtan ang mas higit na kailangan
Opportunity cost: ang halaga ng pagsuko ng benipisyong makukuha
Division of labor: the breakdown of labor
kakapusan: scarcity?? ANg kawalan ng bagay..etc.
equilibrium:no inherit tendency purchase