►according to this document, why were slaves not considered to be
people?

I dont see a document but i think i can still answer your question. Slaves were not considered people because they were owned by people and considered property. Slaves did not have rights like others and were not accounted for until the 3/5 act. And even then only 3 out of 5 slaves were counted to up the population but still did not have rights.

as a result of the development shown on the graph,prices will most likely : the answer is rise

well that depends on how deep the hole is. you'd first go through te crust of the earth, then the upper mantle, then the lower mantle then the outer core, then the inner cor then you'd be stuck in the core to melt.