In a post-scarcity economy, the Golden Standard is a hindrance to the distribution of universal healthcare, shelter, and food. So instead currency is based on a non-finite resource: time. More specifically, it is an amount energy generated per hour of labor.
Basically, because Photon tech makes energy abundant, capital becomes more of a mere formality when it comes to obtaining the necessities (healthcare, shelter, food). The value of more luxurious good is measured differently (the * rating).