A Magazine is a publication that has a publication unit (monthly,
weekly, biweekly), and number of issues left on the subscription. You
should be able to decrement the number of issues left on the subscription.
If you own a magazine, you own a subscription to it. You should be able to
print the title of a magazine and subscribe for an additional year. When
you purchase a subscription you must provide a dollar amount for the
purchase. If the dollar amount is not enough then the ownership should not
change.