Rectangular nodes in Tikz Automata has no outline

Question

Will preface by saying I'm very unfamiliar with Tikz and I just edited a template.
The template was for a state diagram when I wanted to draw Markov chains.
Now, I want square nodes instead of circles because I'm doing something different; the text need causes the circle to be way too huge. I would rather have a rectangle.
I have:
documentclass[a4paper, 12pt, fleqn]{article}
usepackage{tikz} 
usetikzlibrary{automata, positioning, shapes}

being{document}

begin{figure}[H]
    centering
    begin{tikzpicture}[node distance=6.5cm, auto]
       node[state] (TL) {$102$ JPY/USD}; 
       node[state, accepting] (BL) [below of=TL] {$(1+r_{USD})$ USD};
       node[rectangle] (TR) [right of=TL] {$102$ JPY};
       node[state] (BR) [below of=TR] {$(1+r_{JPY})$ JPY};
 
       path[->]
        (TL) edge node {$1 text{USD} times 102 text{JPY}$} (TR)
        (TL) edge node {$r_{USD}$} (BL)
        (TR) edge node {$r_{JPY}$} (BR)
        (BR) edge [bend left] node {$1 text{USD} times 102 text{JPY}$} (BL)
       ;
    end{tikzpicture}
    caption{Covered Interest Rate Parity}
 end{figure}

end{document}

But the TR node does not have an outline around it. I tried a bunch of different keywords I found around google, but only "node" seems to work. Is there no simple keyword option that can get me a rectangle?

Sergio Llorente · Accepted Answer

Add "draw" to "rectangle" to the options of node:
...
node[rectangle, draw] (TR) [right of=TL] {$102$ JPY};
...

By default tikz does not draw the nodes.

Zarko · Answer

I would draw your image on the following way:

define all nodes style used in diagram
use position syntax as defined in position package
enable multi (two) line text in nodes

documentclass[a4paper, 12pt, fleqn]{article}
usepackage{tikz}
usetikzlibrary{arrows.meta, automata, 
                positioning, 
                quotes}
usepackage{amsmath}
usepackage[low-sup]{subdepth}

begin{document}
    begin{figure}[ht]
    centering
    begin{tikzpicture}[
      node distance = 44mm and 66mm, on grid,
state/.append style = {semithick, align=center, inner sep=1pt},
         rct/.style = {draw},
  every edge/.style = {draw, -Straight Barb, semithick},
every edge quote/.style = {auto, font=small}
                        ]
node[state] (TL) {102 JPY/USD};
node[state, accepting] (BL) [below=of TL] {$(1+r_{text{USD}})$ USD};
node[rct]   (TR) [right=of TL] {102 JPY};
node[state] (BR) [below=of TR] {$(1+r_{text{JPY}})$ JPY};
%
path   (TL) edge ["$1,text{USD} times 102,text{JPY}$"] (TR)
        (TL) edge ["$r_{text{USD}}$"] (BL)
        (TR) edge ["$r_{text{JPY}}$"] (BR)
        (BR) edge [bend left, "$1,text{USD} times 102,text{JPY}$"] (BL)
        ;
    end{tikzpicture}
caption{Covered Interest Rate Parity}
    end{figure}
end{document}

Note:
In node style is usually defined:

type of shape (rectangle, circle, ellipse, etc)
shape of border (draw, thickens of lines)
size (width, height)
separation between text and border and border and surrounding
etc.
Some of this attributes have default values (as inner sep, outer sep)
for details see TikZ and PGF manual, chapter 17 Nodes and Edges

Rectangular nodes in Tikz Automata has no outline

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