Dollar Tree (DLTR) shares are sinking after the discount retailer missed second quarter earnings estimates — posting $7.37 billion in revenue (expected $7.49 billion) and adjusted earnings of $0.67 per share (expected $1.05 per share). Dollar Tree also cut its full-year guidance.

Yahoo Finance senior retail reporter Brooke DiPalma breaks down the earnings report, Dollar Tree CEO Rick Dreiling attributing this performance to "immense pressures from a challenging macro environment."

Catch more of Brooke's coverage from the 31st Annual Goldman Sachs Global Retailing Conference.

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This post was written by Luke Carberry Mogan.