There's a huge difference between Macmillan and a writers association that you clearly don't understand. Macmillan buys a finished product, refines it and mass

There's a huge difference between Macmillan and a writers association that you clearly don't understand. Macmillan buys a finished product, refines it and mass produces it. No different than buying iron ore. Amazon is a distributor. This is an argument between Macmillan and Amazon, all the authors under discussion are already locked in binding contracts. The authors may get some benefit out of the increase in e-book prices. However 90% of Macmillan's income isn't coming from its genre imprints, it's likely coming from its imprints that handle their 'best sellers', that won't get many sales through amazon and will be getting virtually none through e-book sales. Why you'd assume Macmillan is acting as the 'union' for less than 5% of its authors is rather strange. This is what the specific writers associations do.