Some tools have graduations to show multiple measurements. for example a ruler may have graduations for both millimeters and centimetres. when measuring the length of an earthworm ,which graduations would allow for the most accurate measurement

the technology changed agriculture in an impacting manner since many people left the field work by a cellular or other technological appliances

i believe the answer is: returns on investments, no wages

people who belong in upper class society would most likely get there by obtaining multiple source of income, which a certain percentage of ownership for businesses. since most of them are job creator, they would most likely get their money from profit, not wages.