Because the unilateral system is easier to get as close to the dimension the engineer specified.
Bilateral tolerancing (also known as symmetric tolerancing) is a method of tolerancing a dimension using equal plus and minus deviations from the nominal dimension.
Unilateral tolerances (also known as asymmetric tolerances) on the other hand specify a deviation in only one direction, either plus or minus, from the specified nominal dimension. Unilateral tolerances may also take the form of plus and plus-plus, minus and minus-minus, or plus or minus some amount and plus or minus a lesser amount.
Answer:
<u>Traders hired more craftspeople to build vehicles for caravans.</u> - Businesses hired more people to make enough goods to trade. - Governments hired more workers to collect taxes from traders.
It helped people move and transport goods to other places
It's Institutional <span> racism</span>
