If you mean the net worth of money, which is zero, yes it is fixed. For one person to have a dollar, another needs to be in debt.
Also, for one person to make profit, they need to spend more than they earn, which inherently means the rest of the economy is in debt. Now you might say the profit will be spent, but then it isn't profit anymore.
Oh and if you want to talk about the real economy, entropy always rises, so no free lunch there either. When the economy grows, all that happens is that the human domain expands and humanity exerts more authority over the processes that occur within its domain. This by definition results in a loss of agency of the non human domain.
Also, for one person to make profit, they need to spend more than they earn, which inherently means the rest of the economy is in debt. Now you might say the profit will be spent, but then it isn't profit anymore.
Oh and if you want to talk about the real economy, entropy always rises, so no free lunch there either. When the economy grows, all that happens is that the human domain expands and humanity exerts more authority over the processes that occur within its domain. This by definition results in a loss of agency of the non human domain.