\documentclass[12pt]{article}
\renewcommand{\baselinestretch}{1.3}
\usepackage{harvard}
\bibliographystyle{economet}

\title{ \vspace{-1cm} Title}
\author{Author\thanks{Thanks to...}
\\ \small{University of ...}
}

\date{Date}

\begin{document}
\maketitle
\renewcommand{\baselinestretch}{1}
\begin{abstract}
{\small Abstract goes here... }
\end{abstract}
\newpage

\renewcommand{\baselinestretch}{1.2}

\section{Introduction}
\section{The Model}
\section{Conclusion}

\bibliography{default}
\end{document}