Why weren't many blue-collar job opportunities available for women before the mid-1970s? Computers have opened up a lot of job opportunities for women that weren't available before, "said Bruce Weinberg, author of the study and assistant professor of economics at: Ohio State University Many blue-collar jobs that once emphasized strength and physical skill are now done by computers, and-can be done easily by women with the right skills“Computers have opened up a lot of job opportunities for women that weren’t available before,” said Bruce Weinberg, author of the study and assistant professor of economics at Ohio State University. “Many blue-collar jobs that once emphasized strength and physical skill are now done by computers, and can be done easily by women with the right skills.” Why weren’t many blue-collar job opportunities available for women before the mid-1970s?