Natasha has joined a gym. She has the option of choosing one of the two trainers, Mathew or Jody. She chooses Jody because she feels that Jody is fitter and more agile than Mathew. Natasha thinks that Jody will be a better trainer even though both Mathew and Jody have equally good records as trainers. Natasha's decision to choose Jody as her trainer is due to source _____