If it is voluntary it is not coercive. You can always not deal with your competition on unfair terms. In what circumstance could a 3rd party non-violent entity coerce you? The biggest one I can think of is "buying you out" but that is still either voluntary, in that the owners agree on the buyout, or it is a buyout of a publicly traded company, and I can't even get started on how non-free market the stock market is, but even then you elected to sell ownership in a public marketplace voluntarily and took that risk.
> Offering a lower price to consumers than your competition is not coercion against a competitor.
It is if you are offering a price lower than your costs which you offset by cash from earlier deals, which the new upstart cannot do. When the new upstart is bankrupt you push the price higher, because now there's no competition anymore. That's the reason such stunts are forbidden (at least in civilized countries).