Final answer:
An improvement in product quality will result in the greatest rightward shift in the demand curve for Good J, as it increases consumer tastes or preferences, leading to more demand at any price level.
Step-by-step explanation:
The student is asking which factor would cause the greatest rightward shift of the demand curve for a good, denoted as Good J. When analyzing these factors, option b, an improvement in product quality, would result in the most significant rightward shift in the demand curve for Good J. This is because an improvement in quality is perceived by consumers as an increase in the intrinsic value of the product, leading to an increase in their tastes or preferences for the product. They would demand more of Good J at any given price, shifting demand to the right.
While an improvement in technology (option a) increases supply, and an increase in need (option c) may also increase demand, these effects may not be as pronounced as the impact of an enhanced product quality on consumer preferences. Hence, the direct effect on demand is from a change in preferences rather than changes in supply or a general increase in needs.
Lastly, it is worth noting that the shift in demand can be temporary or long-term, depending on how the product satisfies the consumers' needs and whether competitors introduce similar quality improvements. Furthermore, the future demand for the product could be affected as consumers may now require less frequent replacements or may anticipate better versions in the future.