Final answer:
The laptop purchased from Costco is the transaction that would contribute to GDP, whereas the others mentioned—money lost in poker, receiving stock, and buying a lamp at a garage sale—do not count towards GDP.
Step-by-step explanation:
Of the transactions listed, the laptop you purchased from Costco would contribute to Gross Domestic Product (GDP), assuming it is new and not a resale. Money lost playing poker, receiving stock as a gift, and buying a lamp at a garage sale do not contribute to GDP as they do not represent production of goods or services within the current year. Other examples of transactions affecting GDP include the cost of hospital stays and the sale of new cars, as part of GDP, whereas a rise in life expectancy, increased variety of cheese, and resale of used items, such as cars, do not contribute to GDP calculations.