Right-aligned or flush-right type can be effective for short bursts of text like captions, pull quotes, or sometimes headlines. Because we read from the left, right-aligned type is hard going for anything more than a few lines. The unevenness of the rag becomes distracting and finding the beginning of lines is difficult.
Figure 8.18. Right-aligned type used for captions. The type is also set to align to the bottom of the text frame, making it easy to align the baselines of the type with the bottom of the picture frame. See below for vertical alignment.