Investment spending is to long-run aggregate supply as ____ is to ____.

Investment spending is important for long-run aggregate supply because it helps businesses grow and produce more goods and services over time. When companies invest in new equipment, technology, or buildings, they can make things more efficiently and increase their output. This is similar to how education improves a worker's skills, leading to more productivity. For example, if a factory buys new machines, it can produce more products faster, which boosts the overall supply in the economy. So, investment spending is to long-run aggregate supply as education is to worker productivity.