Deborah is training for a triathlon, a timed race that combines swimming, biking, and running. consider the following sentence: because her pool sessions are her swim more quickly, deborah plans to reduce by 1 hour per week the time she spends training on the bike and increase by 1 hour the time she spends in the swimming pool; however, her husband says that she should stop doing any biking and running and spend all 20 hours per week in the pool. which basic principle of individual choice does deborah's plan illustrate that her husband's advice does not?

a. many decisions are made on the margin.
b. people usually exploit opportunities to make themselves better off.
c. resources are scarce.
d. all costs are opportunity costs.

Select the statement that indicates tina's company is a partnership. tina jones is a dancer specializing in latin dance styles. she always wanted to have her own dance studio where she could teach dancing to young and old alike. in 2006, she opened her first dance studio, electric diva, in madison triangle. it was a great choice as a business location because it's well-connected by highways to most places in the city. she leased the space for three years. her initial investment included a good sound system, cheerful interior design, and strong flooring. to raise capital for the business, tina turned to her brother-in-law, philip. philip made half the financial investment. he manages the accounts and social media needs of the business. he has a 30% share in trisha's business. together, they expanded the business to three dance studios in the city and plan to open franchises in other cities.