I believe the answer is: <span>Primary Reinforcer
</span><span>Primary Reinforcer refers to the things that could influence human behaviors that derived from baisc needs (such as foods and drinks)
Compared to other type of reinforcer, primary reinforcer is the type of reinforcer that is purely biologoical</span><span />
<u>Marginal Costs & Marginal benefits in a choice you made.</u>
Assume that I want to buy an ornament for hands. I spend $500 for purchasing an ornament. When I was supposed to see another I wish to buy that. But spending again for the ornaments also not a good idea. I am also not willing in spending $500 for the ornament. So, I decided to go for an ornament that costed only $250. No, my marginal benefit get decreased from $500 to $250. When I decided to go fro the second one or more than one of same good my marginal benefits decrease.
Marginal cost is something that changes in a smaller range in the production of one additional unit. For example I decide to manufacture 500 pens. i need raw materials for the production and a building and machine for production. The change in the cost or expenses that happens when I decide to produce 600 pens is the marginal cost.
Cotton constantly needs the name nutrients from the soil and finally the soil didn’t have those nutrients and were no longer able to house cotton that’s often why farmers switch they’re crops yearly so the soil can rebuild the nutrients it needs
