One study, published by the US-based National Bureau of Economic Research, found that gender bias has long-lasting ramifications upon primary school pupil's life goals.
"Our results suggest that teachers' biases favoring boys have an asymmetric effect by gender— positive effect on boys' achievements and negative effect on girls'. [...]
"These results suggest that teachers' biased behavior at early stage of schooling have long run implications for occupational choices and earnings at adulthood, because enrollment in advanced courses in math and science in high school is a prerequisite for post-secondary schooling in engineering, computer science and so on," the study found.