Ethics, also known as moral philosophy, is a branch of philosophy that involves systematizing, defending, and recommending concepts of right and wrong behavior. The rules of conduct recognized in respect to a particular class of human actions or a particular group, culture, etc. medical ethics; Christian ethics. Moral principles, as of an individual: His ethics forbade betrayal of a confidence.
Captialism is an economic system not a moral/ethical code. Ethics can be applied to human behavior of any sort. I don't know how descriptive or meaningful it is to describe capitalism as ethical or unethical. You can describe people and their conduct as ethical or unethical, but I don't know how you describe an economic system that way.