Final answer:
Workers can boost their income by gaining additional related skills, working overtime, negotiating raises based on performance, networking for better opportunities, or exploring entrepreneurship.
Step-by-step explanation:
A worker can increase their income without increasing educational attainment through several strategies. One way is to gain additional skills related to their current job or industry, which can make them more valuable to their employer without necessarily obtaining a new degree. Another approach is to seek out opportunities for overtime work or to take on a second job to increase earnings. Workers can also negotiate with their current employer for a raise based on their performance and contributions to the company. Networking and building professional relationships can lead to opportunities for higher paying positions or promotions even without further formal education. Lastly, exploring entrepreneurship and starting a small business can also be a path to increasing income, leveraging skills, and experiences they already possess.