Final answer:
In the 1990s, personal computers became less expensive and easier to use due to technological advances like the microchip and improvements in user interfaces.
Step-by-step explanation:
As personal computers increased in popularity in the 1990s, they also became less expensive and easier to use. This is attributed to advancements such as the microchip, which greatly reduced the size and cost of computers, allowing companies like Apple and IBM to mass-produce personal computers for consumers and businesses. By the late 1980s and throughout the 1990s, the widespread use of microprocessors in various electronic devices and the innovation in user interfaces, such as the one popularized by Apple with its Macintosh computer, contributed to making personal computers more common and user-friendly.