What is the opportunity cost in this scenario? gretchen earned $500 from her summer job. she made a list of things that she wants to do with the money she earned. she thought of spending $100 to buy a guitar amplifier, enrolling in a ballet class for $200, buying new clothes worth $100, and giving her mom a silver necklace worth $100. when she went to buy the amplifier, she found it cost around $150. she knew that she couldn’t change the fee for the dance classes. so she had to adjust the budget for her clothes or her mom’s gift. in the end, she decided she would buy one pair of jeans instead of the two pairs of jeans she had planned.

What problem does obeng say that we have in the 21st century? 2. obeng argues that the pace of change has eclipsed the pace of learning. do you agree or disagree? why? 3. what is "smart failure" according to obeng?

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a. a researcher uses the customs office’s passenger lists for ships bringing immigrants to the us between 1820-1845 to track the numbers of immigrants from certain ethnic groups. b. a researcher conducts a linguistic study of comments posted on a local public blog. c. a developmental psychologist videotapes interactions between groups of toddlers and their care givers to determine which intervention methods most effectively manage aggression. d. a researcher asks the director of a local free clinic about the number of patients in the last two years with newly diagnosed hiv/aids.

On average, being married has a(n) effect on happiness.