\documentclass[fleqn]{article}
\usepackage{arev}
\linespread{1.15}
\makeatletter
\def\@runin#1{{\normalsize\bfseries\itshape #1.}}
\def\subsection{\@startsection{subsection}{2}{\z@}%
  {6pt}{-0.5em}{\@runin}}
\makeatother
\pagestyle{empty}
\textwidth2.6in
\hyphenation{es-ti-ma-ted eco-no-me-tric}
\begin{document}
\input{jj_mathinc}
\end{document}
