Lagrange multiplier symbol code

Economists often denote a Lagrangian maximization problem with a scripted L. Unless you exert a little bit of effort, this looks poorly when produced by LaTeX. The code below allows you to easily typeset the symbol in a larger font-size.

The code creates four new commands: lagrange1, lagrange2, lagrange3, and lagrange4. They produce the “Lagrangian L” with increasing size.

documentclass{article}
usepackage{relsize}
usepackage{mathrsfs}
usepackage{xstring}
newcommand{lagrange}[1]{IfEqCase{#1}{{1}{mathscr{L}}{2}{mathlarger{mathscr{L}}}{3}{mathlarger{mathlarger{mathscr{L}}}}{4}{mathlarger{mathlarger{mathlarger{mathscr{L}}}}}}}
begin{document}
$$ lagrange1 $$
$$ lagrange2 $$
$$ lagrange3 $$
$$ lagrange4 $$
end{document}