def build_market(type, postal_code, radius=5)
    case type
    when "Metro"
      return Markets::Cbsa.new :name => postal_code.cbsa_name
    when "County"
      return Markets::County.new :name => postal_code.county, :ansi => postal_code.county_ansi
    when "DMA"
      return Markets::Dma.new :name => postal_code.dma.name, :external_key => postal_code.dma.external_key, :rank => postal_code.dma.rank
    when "Radius"
      return Markets::Radius.new :name => postal_code.city, :point_of_origin => postal_code.zip_code, :size => radius.to_i
    else
      return Markets::Cbsa.new :name => postal_code.cbsa_name, :division_name => postal_code.cbsa_division_name, :cbsa_type => postal_code.cbsa_type
    end
  end