For example, last November I told you about United Parcel Service (UPS) where I paid $95 a share, yielding 6.9 per cent gross income. Since then, the share price has risen to $120, pushing the yield down to 5.6 per cent for buyers today. But there are several reasons this Atlanta-based business — which will trade ex-dividend or without rights to the next income payment from Tuesday — might have further to go. First, it is the largest company in a growing global market where it helps to be big to cope with small profit margins. UPS has a stock…