\begin{tikzpicture}
	\draw[thick,->] (0,0) -- (3.5,0);
	\draw[thick,->] (0,0) -- (0,3.5);

	\node at (3.3, -0.2) {$x_1$};
	\node at (-0.2, 3.3) {$x_2$};

	\node at (-0.1, -0.3) {$(0,0)$};
	\node at (-0.1, 2.3) {$(0,1)$};
	\node at (2.0, -0.3) {$(1,0)$};
	\node at (2.2, 2.3) {$(1,1)$};

	\filldraw[blue] (0,0) circle (2pt);
	\filldraw[red] (0,2) circle (2pt);
	\filldraw[red] (2,0) circle (2pt);
	\filldraw[blue] (2,2) circle (2pt);
\end{tikzpicture}