# Why does the local density approximation (LDA) overestimate atomization energy?

I have read numerous times that the local density approximation (LDA) overestimates atomization energy. For example, here is a quote from Dr. Burke's book:

LDA typically overbinds molecules by about $30~\mathrm{kcal\, mol^{-1}}$.

What is the cause? Is it the same problem that Hartree-Fock theory has when compared to the exact Schrödinger solution (lack of correlation between electrons)? Also, how can inclusion of gradient can help solve this problem?

• @ToddMinehardt When you introduce MathJax, please use it for the whole construct and not just sub/superscripts. It might lead to a very undesirable typeset on other computers, esp. mobile devices. – Martin - マーチン Jun 28 '16 at 16:03
• @Martin-マーチン - Will do! – Todd Minehardt Jun 28 '16 at 20:12