What is the slope of the budget line and how does it impact the consumer's purchasing decisions?

The slope of the budget line represents the rate at which one good can be exchanged for another. A steeper slope indicates a higher opportunity cost of one good in terms of the other. This impacts the consumer's purchasing decisions by showing the trade-off between the two goods - a steeper slope means the consumer has to give up more of one good to get more of the other, influencing their choices based on their preferences and budget constraints.