Basic template based on the built-in "article" class for working papers in economics and management journals
\documentclass[12pt]{article}
\usepackage{amssymb,amsmath,amsfonts,eurosym,geometry,ulem,graphicx,caption,color,setspace,sectsty,comment,footmisc,caption,natbib,pdflscape,subfigure,array,hyperref}
\normalem
\onehalfspacing
\newtheorem{theorem}{Theorem}
\newtheorem{corollary}[theorem]{Corollary}
\newtheorem{proposition}{Proposition}
\newenvironment{proof}[1][Proof]{\noindent\textbf{#1.} }{\ \rule{0.5em}{0.5em}}
\newtheorem{hyp}{Hypothesis}
\newtheorem{subhyp}{Hypothesis}[hyp]
\renewcommand{\thesubhyp}{\thehyp\alph{subhyp}}
\newcommand{\red}[1]{{\color{red} #1}}
\newcommand{\blue}[1]{{\color{blue} #1}}
\newcolumntype{L}[1]{>{\raggedright\let\newline\\arraybackslash\hspace{0pt}}m{#1}}
\newcolumntype{C}[1]{>{\centering\let\newline\\arraybackslash\hspace{0pt}}m{#1}}
\newcolumntype{R}[1]{>{\raggedleft\let\newline\\arraybackslash\hspace{0pt}}m{#1}}
\geometry{left=1.0in,right=1.0in,top=1.0in,bottom=1.0in}
\begin{document}
\begin{titlepage}
\title{Placeholder\thanks{abc}}
\author{Hyunwoo Park\thanks{abc} \and John Smith\thanks{abc}}
\date{\today}
\maketitle
\begin{abstract}
\noindent Placeholder\\
\vspace{0in}\\
\noindent\textbf{Keywords:} key1, key2, key3\\
\vspace{0in}\\
\noindent\textbf{JEL Codes:} key1, key2, key3\\
\bigskip
\end{abstract}
\setcounter{page}{0}
\thispagestyle{empty}
\end{titlepage}
\pagebreak \newpage
\doublespacing
\section{Introduction} \label{sec:introduction}
\section{Literature Review} \label{sec:literature}
\section{Data} \label{sec:data}
\section{Results} \label{sec:result}
\section{Discussions} \label{sec:discussion}
\section{Conclusion} \label{sec:conclusion}
\singlespacing
\setlength\bibsep{0pt}
\bibliographystyle{my-style}
\bibliography{Placeholder}
\clearpage
\onehalfspacing
\section*{Tables} \label{sec:tab}
\addcontentsline{toc}{section}{Tables}
\clearpage
\section*{Figures} \label{sec:fig}
\addcontentsline{toc}{section}{Figures}
%\begin{figure}[hp]
% \centering
% \includegraphics[width=.6\textwidth]{../fig/placeholder.pdf}
% \caption{Placeholder}
% \label{fig:placeholder}
%\end{figure}
\clearpage
\section*{Appendix A. Placeholder} \label{sec:appendixa}
\addcontentsline{toc}{section}{Appendix A}
\end{document}