The parent poster said "Economy plus", not "Premium Economy".
And while the names are confusingly similar, Economy Plus is usually a seat with extra legroom (but no additional width) and is a small price bump, but Premium Economy is a larger wider seat with generous recline (but not lay-flat), and is a large price increase, sometimes approaching business class pricing.
And while the names are confusingly similar, Economy Plus is usually a seat with extra legroom (but no additional width) and is a small price bump, but Premium Economy is a larger wider seat with generous recline (but not lay-flat), and is a large price increase, sometimes approaching business class pricing.