You can have very different opinion about friction depending on where it is. You won't use the same lube that you use on your crankshaft on your brakes. At leas

You can have very different opinion about friction depending on where it is. You won't use the same lube that you use on your crankshaft on your brakes. At least I hope so - the last time I saw "My brakes are screeching I greased them" was hilarious, but that is what bumpers are for. So we want lower barriers to entry in trading and moving capital to the productive sectors of the economy and smarter trades. That is why the transaction tax could be helpful - we want to move the largest amount of capital to the economy and not the maximum possible numbers of transactions.