Final answer:
An increase in the supply of phones in response to a price rise suggests that phones are a normal good, as suppliers are willing to provide more of these goods as the price, and potentially their profits, increase.
Step-by-step explanation:
When the price of phones increases from $1000 to $1500, and the quantity supplied increases, this change is best described using economic concepts of goods. Since a rise in income typically leads to an increase in the quantity consumed of a good, and a fall in income results in a decrease, such goods are called normal goods. This means that as people have more income, they tend to purchase more of these goods, which is the pattern we see with the phones in question. The increase in supply in response to a price increase does not directly relate to consumer income levels, but rather to supplier's production and market supply decisions.
When the price of phones increases from $1000 to $1500, and the quantity supplied increases, this change can be best described as a substitute good. A substitute good is a product that can be used as an alternative to another product. In this case, when the price of phones increases, consumers may choose to buy a different brand or a different type of phone as a substitute.