[Tex/LaTex] Framed paragraph with double-line frame

boxesframedmdframed

Regarding various ways but most requires rigorous settings to embed a paragraph of words in a box or a frame with double-line box, I try to use a single commend to acquire the effect.

enter image description here

However, just as the picture has shown, the "doublebox" command in fancybox fails to wrap the words into paragraph. As for the "framed" command, it doesn't provide a "double-line" frame but actually wraps the paragraph instead.

Is there another command or a slight modification to the current code to warp a paragraph into a doubled-line frame(box)? 

\documentclass[11pt]{article}
\usepackage{fancybox,framed}
\begin{document}
\doublebox{Over the past twenty years, the study of industrial organization—the analysis of imperfectly competitive markets—has grown from a niche area of microeconomics to a key component of economics.}\\

\begin{framed}
Over the past twenty years, the study of industrial organization—the analysis of imperfectly competitive markets—has grown from a niche area of microeconomics to a key component of economics. 
\end{framed}
\end{document}

Best Answer

\documentclass[11pt]{article}
\usepackage{fancybox,framed}
\begin{document}
\doublebox{%
\begin{minipage}{4in}
Over the past twenty years, the study of industrial organization—the analysis of imperfectly competitive markets—has grown from a niche area of microeconomics to a key component of economics.
\end{minipage}}\\
\begin{framed}
Over the past twenty years, the study of industrial organization—the analysis of imperfectly competitive markets—has grown from a niche area of microeconomics to a key component of economics. 
\end{framed}
\end{document}

doublebox

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