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\title{\vspace{-1.5cm}\fontsize{15}{20}\selectfont\textbf{Centers for Disease Control and Prevention as a Strategic Agent in the Pediatric Vaccine Market: An Analytical Approach}}
\date{}
\author{\fontsize{12}{15}\selectfont \textbf{abc rockets}}
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\begin{document}
\citet{ref1} developed a vaccine pricing strategy, keeping the CDC as a potential player to stabilize the market and to keep the public sector prices as low as possible to \textbf {reduce the risk of a monopoly formation}. The risk of having a market with only one manufacturer is established in Table 1. We observe that the pricing dynamics shifts when market has one, two, or three manufacturers using examples of prices (in price in USD/ dosage) of Varicella, Hepatitis B (Hep B), and Haemophilus influenza type b (Hib) from 2010 to 2020.
\begin{table}[ht]\small
\caption{Pediatric Vaccine Markets}
\centering
\begin{tabular} {c c c c }
\hline
Year & Varicella(monopoly) & Hep B (duopoly) & HiB(triopoly)\\
\hline
2010 & \$64.53 & \$9.88 & \$ 9.54 \\
2020 & \$109.26 & \$18.96 & \$10.91\\
\hline
\end{tabular}
\end{table} We see that the monopoly market has highest price increase followed by a duopoly market and triopoly market. Thus, the pediatric vaccine market will have the lowest cost of vaccines when there are more manufacturers. Following \citet{ref1}, we studied pediatric vaccine market through a case study on the DTaP vaccine market in the United States.\\ Competitive DTaP vaccine market is dominated by two manufactures: GSK and Sanofi Pasteur which produce Infanrix and Daptacel respectively. The vaccines are considered to be competitive if they are produced according to the US Routine Immunization Schedule (RIS)
\end{document}
我不知道为什么表格结束后会出现小间距。我试图删除它，但不起作用。
答案1
缩进不是“无缘无故的”，你明确地在“2020”之后用一个空行结束了上一段。因此下面的文本是一个新段落，因此缩进。如果你删除空行，那么下面的文本就是同一段的一部分。
\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage
[
a4paper,% other options: a3paper, a5paper, etc
left=2.54cm,
right=2.54cm,
top=2.54cm,
bottom=2.54cm,
% use vmargin=2cm to make vertical margins equal to 2cm.
% us hmargin=3cm to make horizontal margins equal to 3cm.
% use margin=3cm to make all margins equal to 3cm.
]
{geometry}
%% Useful packages
%\usepackage{hyperref} %for linking stuff within the document
\usepackage{amsmath,amsthm,amssymb,amsfonts}
\usepackage{graphicx}
%\usepackage[colorinlistoftodos]{todonotes}
\usepackage[colorlinks=true, allcolors=blue]{hyperref}
\usepackage{float}
\usepackage[none]{hyphenat}
\usepackage{comment}
\usepackage{ulem}
\usepackage{setspace}
\usepackage{url}
\usepackage{subfigure}
\usepackage[square,numbers]{natbib}
\bibliographystyle{plainnat}
\usepackage{mathtools}
\usepackage[title]{appendix}
\usepackage{tabularx}
\usepackage{longtable}
\usepackage{optidef}
\usepackage{tikz}
\usepackage{titlesec}
\usetikzlibrary{shapes.geometric, arrows}
\titleformat{\section}
{\normalfont\fontsize{12}{15}\bfseries}{\thesection}{1em}{}
\titleformat{\subsection}
{\normalfont\fontsize{12}{15}\bfseries}{\thesubsection}{1em}{}
\usepackage{caption}
\captionsetup[table]{skip=2pt}
\usepackage{array}
\usepackage{booktabs}
\usepackage{float}
\title{\vspace{-1.5cm}\fontsize{15}{20}\selectfont\textbf{Centers for Disease Control and Prevention as a Strategic Agent in the Pediatric Vaccine Market: An Analytical Approach}}
\date{}
\author{\fontsize{12}{15}\selectfont \textbf{abc rockets}}
\doublespacing
\begin{document}
\citet{ref1} developed a vaccine pricing strategy, keeping the CDC as a potential player to stabilize the market and to keep the public sector prices as low as possible to \textbf {reduce the risk of a monopoly formation}. The risk of having a market with only one manufacturer is established in Table 1. We observe that the pricing dynamics shifts when market has one, two, or three manufacturers using examples of prices (in price in USD/ dosage) of Varicella, Hepatitis B (Hep B), and Haemophilus influenza type b (Hib) from 2010 to 2020.
\begin{table}[ht]\small
\caption{Pediatric Vaccine Markets}
\centering
\begin{tabular} {c c c c }
\hline
Year & Varicella(monopoly) & Hep B (duopoly) & HiB(triopoly)\\
\hline
2010 & \$64.53 & \$9.88 & \$ 9.54 \\
2020 & \$109.26 & \$18.96 & \$10.91\\
\hline
\end{tabular}
\end{table} We see that the monopoly market has highest price increase followed by a duopoly market and triopoly market. Thus, the pediatric vaccine market will have the lowest cost of vaccines when there are more manufacturers. Following \citet{ref1}, we studied pediatric vaccine market through a case study on the DTaP vaccine market in the United States.\\ Competitive DTaP vaccine market is dominated by two manufactures: GSK and Sanofi Pasteur which produce Infanrix and Daptacel respectively. The vaccines are considered to be competitive if they are produced according to the US Routine Immunization Schedule (RIS)
\end{document}
