SPNE of a normal form game If we have a sequential game which is equivalent to a simultaneous move game because of its information structure, then the NE we find are also SPNE?
If you draw the corresponding game tree, you will see that &quot;equivalent to simultaneous move game&quot; implies that the game has no proper subgame and the only subgame is the whole game.
This is because the information set of the second player covers every move of the first player.
Therefore, every Nash equilibrium is trivially also subgame perfect.