What major barrier to employment is highlighted in demand-side employment research?

The choice that highlights a major barrier to employment in demand-side employment research focuses on employers' misperceptions about individuals with disabilities. This research indicates that employers often hold biases or unfounded beliefs regarding the capabilities, work ethic, and productivity of individuals with disabilities. Such misperceptions can lead to a reluctance or refusal to hire these individuals, regardless of their actual qualifications or ability to perform job tasks effectively.

Addressing these biases through education and outreach can play a significant role in reducing barriers to employment for people with disabilities. The negative impact of such misperceptions is substantial, as it not only affects hiring practices but can also influence workplace culture and opportunities for career advancement for individuals with disabilities.

The other options, while they present valid challenges to employment, do not capture the nuance of demand-side employment research that underscores the importance of changing employer attitudes as a critical factor in enhancing employment opportunities for individuals with disabilities.