March 14 (Reuters) - Dollar General joined rival Dollar Tree in projecting annual profit below Wall Street estimates on Thursday, in a sign that higher costs as well as a shift in customer spending towards lower-margin consumables weighed on its margins.

The discount retailer expects 2024 profit between $6.80 and $7.55 per share. Analysts' on average estimate profit to grow to $7.55 per share, according to LSEG data. (Reporting by Granth Vanaik and Anuja Bharat Mistry in Bengaluru; Editing by Pooja Desai)