Health economics is about understanding how we use resources (like money and time) to keep people healthy and treat them when they get sick.
Policy is like a set of rules that governments and other organizations use to make decisions about what resources to use and how to use them to make the most people healthy.
Law is like the rules everyone has to follow. Sometimes, the law is used to make sure people get the health care they need and to make sure everyone is treated fairly when they're sick.
When we talk about health economics, policy, and law, we're trying to figure out how to use resources and rules to make sure everyone has access to the health care they need, regardless of how much money they have or where they live. This can involve figuring out how to pay for health care, deciding what treatments are worth the cost, and making sure everyone's health needs are met.