# Drawing a two-sided trade graph on Tikz

I am trying to draw the following graph on Latex using Tikz:

I want the caption of the figure to be below.

I have been using the following codes:

\begin{figure}
\centering
\begin{tikzpicture}[>=latex]
\node[mybox] (Betty) [below right =of Charlie, fill=blue!30] {\textbf{Betty}\\ Wants afternoon bread}edge [->] node[below=10pt,name=AB] {Tangerines} (Adam) edge[<-] node[right=10pt,name=BC] {Apples} (Charlie) ;
\end{tikzpicture}
\caption{Lack-of-double-coincidence-of-wants problem}


But I am getting this output:

So any help would be appreciated on showing me how to draw the above figure. The caption of the figure is fine because I prefer it to be below.

I feel you would be better off if you posted a complete minimal working example, and refer to the earlier posts that you intend to keep using. This answer provides working codes and links (and in case someone shows up stating things become so much simpler when using quotes: please take such statements with a grain of salt ;-). I added two versions, one with straight arrows, and one with bent arrows (which I personally like better), and also slightly modified the mybox style from this answer.

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{positioning,shapes.misc}
\tikzset{% from https://tex.stackexchange.com/a/514738/194703
mybox/.style={rounded rectangle,draw=black,align=center,inner ysep=1ex,
execute at begin node=\strut},
}
\begin{document}
\begin{figure}[htb]
\centering
\begin{tikzpicture}[>=latex,font=\sffamily]
\node[mybox] (Betty) [right =of Adam, fill=blue!30]
([yshift=-1.2em]Betty.west) edge[thick,->] node[below=1ex,name=BA] {Produces Night Bread}
([yshift=1.2em]Betty.west);
\end{tikzpicture}
\caption{Lack-of-double-coincidence-of-wants problem.}
\end{figure}

\begin{figure}[htb]
\centering
\begin{tikzpicture}[>=latex,font=\sffamily]