The Supreme Court's power would be diminished if they give advisory opinions. Courts are designed to objectively look at situations that are happening between parties. If they input their opinion in a particular decision, then they would have become biased and ruled out their objectivity. In able for them to become in control, they need to always watch from the sidelines and then decide afterwards.
Yes McDonald is a world wide franchise they sell all over Japan, China, Mexico, I would say yes compared to burger king, wendys, apple bees, in and out,