The phrase "high demand" refers to a situation where there is an increased need or requirement for something, often resulting in a shortage. This could be due to various factors such as high consumer interest, limited supply, or a combination of both. When a product or service has high demand, it means that people are actively seeking it out and are willing to pay a premium price for it. In economics, this can lead to an increase in prices as suppliers attempt to meet the increased demand by producing more goods or raising their prices. Overall, "high demand" indicates a strong market desire for something, which can be both positive and negative depending on whether supply can keep up with that demand.