Following San Francisco's teachers strike and the threat of others in California, it’s worth taking a look at a comprehensive recent study on strikes. It found that teacher strikes don’t typically help or harm student achievement much. The notable exception was very long strikes, lasting 10 or more days. Those did cause short-term drops in math scores. Overall, strikes were successful in getting teachers higher pay.
In two recent papers, a team of researchers used detailed data from Oregon to look at the relationship between family income and students' chances of being identified as gifted and as having a disability.