I've only just started reading the rules but the following looks incorrect to me. However, I cant see where it has been raised as a question before so wonder if I am missing some detail or misunderstanding because I haven't finished the rules.
on page 6, 2nd part of the example
The Yellow player modifies the price of properties, increasing the market price of Manor houses and also rearranging the other values.
but the manor modifier changes from +1 to -3. ?