Sheila owns a fabric shop and has only one long time employee, Maria, who takes care of the store when Sheila is on vacation. During one of her absences, Maria has to deal with a question from a vendor who selling fabric to the store on a previously negotiated written order. Maria has worked with vendors before. This particular vendor has a question regarding the fabric written order, and Maria agrees to change the order resulting in an increase in price which Sheila disputes on her return claiming that Maria was not authorized to change the order. If sued, Sheila is likely to lose the case because Maria as Sheila's agent is likely to be found as having authority to bind Sheila, as the principal in the describe circumstances. What is this type of authority called?