Answer:
Mongols contributed to a more unified Afro-Eurasia through its religious tolerance and support of merchants This increased the rate of spread of religions.
The Mongol Empire also stimulated tangible exchange of peoples and cultures through its policy of forcibly moving many skilled craftsmen and educated people from their homelands to distant parts of the empire. This mixing of culture helps in ethnic tolerance also.
Make laws :3 (here are a some words because my original answer was *too short*)
Living conditions were degrading and the need for more men in the war.
Consumer tastes or preferences would most likely have an effect on D. DEMAND.
If a product is numerous and affordable but is not in accordance to consumer's taste or preference, then there will be no demand on the product supplied.
If the product has limited stock and is costly but it is preferred by the consumers, then demand of the good will still be steady.