Update lectures/lp_intro.md

Co-authored-by: Matt McKay <mmcky@users.noreply.github.com>
QuantEcon · Jul 23, 2024 · 980e784 · 980e784
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@@ -91,7 +91,7 @@ $$
 
 The following graph illustrates the firm's constraints and iso-revenue lines.
 
-Iso-revenue lines show all the combinations of materials and labor producing the same revenue.
+Iso-revenue lines show all the combinations of materials and labor that produce the same revenue.
 
 ```{code-cell} ipython3
 ---