Final answer:
Performance curves have the limitation of not necessarily measuring permanent changes in performance; they may only show temporary improvements or declines. Despite revealing patterns, graphs can be misleading and may not reflect long-term trends or efficiencies.
Step-by-step explanation:
One limitation in the usefulness of performance curves is that they do not measure relatively permanent changes. Performance curves can plot individual or average performance against practice trials and reflect the law of practice, showing variations that can either increase or decrease with experience. However, these curves can also be misleading as graphical representations may alter how patterns and trends are perceived, not always capturing long-term learning or skill retention.
A line graph is a tool often used in economics to illustrate continuous data such as prices, wages, and the size of the economy. Still, it is essential to recognize that, particularly when dealing with performance over time, the line connecting the dots may not represent genuine sustained improvements or decline. Thus, while performance curves like average cost, average variable cost, and marginal cost show general patterns, these do not necessarily translate to permanent operational efficiency gains or cost management.