it's costing people a lot of money isn't really an antecedent it is the effect of whatever this is. For example, I suppose the reason everyone is so interested in the rising cost of oil is because it is costing people a lot of money. I suppose the reason everyone is so interested in the new parking fines is because they are costing people a lot of money.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.