Yes, totally agreed (/probably poorly described) - start revenue neutral as you have, then the following year just use the % of GDP from this year as the initia

Yes, totally agreed (/probably poorly described) - start revenue neutral as you have, then the following year just use the % of GDP from this year as the initial "set point". Then you get both: revenue-neutral cold start plus a % pegged to GDP moving forward. Good idea wrt land-value and pollution/sustainability taxes too, makes total sense.