Why are Domino's Pizza Group (LSE:DOM) shares whipsawing on the FTSE 250 this week?

Highlights
- Domino's slipped among [FTSE 250] fallers midweek before bouncing on Thursday.
- The group holds the master franchise for Domino's in the UK and Ireland.
- UK consumer confidence rose to a more than two-year high in today's GfK
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