Although slaves had been sold in the American colonies since at least 1619, slave labor did not come to represent a significant proportion of the labor force in any part of North America until the last quarter of the 17th century. After that time, the numbers of slaves grew exponentially.
A Pharmacologist earns an average salary of $103,686 per year. For the first five to ten years in this position, salary increases sharply, but any additional experience does not have a big effect on pay.
The median annual wage for medical and clinical laboratory technologists was $60,520 in May 2015. The median wage is the wage at which half the workers in an occupation earned more than that amount and half earned less. The lowest 10 percent earned less than $41,510, and the highest 10 percent earned more than $84,300. The median annual wage for medical and clinical laboratory technicians was $38,970 in May 2015. The lowest 10 percent earned less than $25,890, and the highest 10 percent earned more than $60,810.