When we talk about BKC and NBT, both appear to be equal to $1 and a 1:1 peg seems natural. However, as B&C sells BKC for $1 but does not buy them back, BKC is always <$1, whereas NBT is always ~$1. That means that they may have very different real values. It quickly becomes clear that B&C is destined to profit from a 1:1 peg at the cost of Nu.
So what if Nu lets that happen, but charges B&C to do it? More specifically, what if Nu liquidity providers are awarded BKS for using their NBT to support a weak BKC peg? It could be a tiered kind of thing, such that a buy order that is close to 1 BKC = 1 NBT is awarded more than an order at 1 BKC = 0.5 NBT. By only paying the buy side liquidity and doing it all internal to the B&C exchange, the reward necessary to stimulate a healthy buy side may end up being very cheap.
This does not affect Nu very much (no motion necessary) except that it gives additional business and possibly even healthy competition for liquidity providers (drawing them from pairs like nbt/btc and into nbt/bkc). B&C would need to be printing the BKS, so the question is whether BKC buy liquidity is worth it to them (at something like 0.5 NBT/BKC I think it would be worth it).
Is this method cheaper than selling BKS to buy back BKC?
I think we’ll find that if the BKS market is illiquid the answer is yes.