plot-intersections+geometry.tex

\documentclass[tikz,border=10pt]{standalone}
%\documentclass[crop, tikz]{standalone}

\usepackage{tikz}

\begin{document}
	
\usetikzlibrary{arrows}
\begin{tikzpicture}[
	scale=5,
	axis/.style={very thick, ->, >=stealth'},
	important line/.style={thick},
	dashed line/.style={dashed, thin},
	pile/.style={thick, ->, >=stealth', shorten <=2pt, shorten
		>=2pt},
	every node/.style={color=black}
	]
	% axis
	\draw[axis] (-0.1,0)  -- (1.1,0) node(xline)[right]
	{$G\uparrow/T\downarrow$};
	\draw[axis] (0,-0.1) -- (0,1.1) node(yline)[above] {$E$};
	% Lines
	\draw[important line] (.15,.15) coordinate (A) -- (.85,.85)
	coordinate (B) node[right, text width=5em] {$Y^O$};
	\draw[important line] (.15,.85) coordinate (C) -- (.85,.15)
	coordinate (D) node[right, text width=5em] {$\mathit{NX}=x$};
	% Intersection of lines
	\fill[red] (intersection cs:
	first line={(A) -- (B)},
	second line={(C) -- (D)}) coordinate (E) circle (.4pt)
	node[above,] {$A$};
	% The E point is placed more or less randomly
	\fill[red]  (E) +(-.075cm,-.2cm) coordinate (out) circle (.4pt)
	node[below left] {$B$};
	% Line connecting out and ext balances
	\draw [pile] (out) -- (intersection of A--B and out--[shift={(0:1pt)}]out)
	coordinate (extbal);
	\fill[red] (extbal) circle (.4pt) node[above] {$C$};
	% line connecting  out and int balances
	\draw [pile] (out) -- (intersection of C--D and out--[shift={(0:1pt)}]out)
	coordinate (intbal);
	\fill[red] (intbal) circle (.4pt) node[above] {$D$};
	% line between out og all balanced out :)
	\draw[pile] (out) -- (E);
\end{tikzpicture}
	
\end{document}