Answer:
social bookmarking sites
Explanation:
Reddit, Digg and StumbleUpon are all Web sites dedicated to social bookmarking.
They fetch the contents from other Web sites and encourage their users to share their preferences on what they like and see all over the Internet with their friends.
They're not social networks per say because people aren't directly in contact with each other, only through their shared contents.
They're not tech blogs, because they rarely have any original contents and they're not targeting only technologies.
They're not video sites either, because they're sharing all kinds of contents.
Answer:
2 and 4
Explanation:
Japanese worker can produce 6 units of steel or 3 televisions per hour.
Korean worker can produce 8 units of steel or 2 televisions per hour.
Opportunity cost is the cost of the lost alternative. So when the country decides to produce only televisions it has to give up on steel production. Thus, the units of steel forgone for each unit of television gained is an opportunity cost of a television.

Thus,
Opportunity cost of television for Japan = 
Opportunity cost of television for Korea = 
Answer:
D. decreases initially and then is horizontal.
Explanation:
A horizontal long run average cost curve reflects increase in cost proportionate to output, so the firm's long run average cost curve will fall initially and then become horizontal.
Answer:
Ski Golf Fishing
Guard Guard Guard
selling price $260 $330 $205
variable cost $120 $180 $135
contribution margin $140 $150 $70
machine time 9 min. 12 min. 11 min.
lbs. of pellets 12 7 11
total machine time is the constraint in the production process
1a)
contribution margin per $933.33 $750 $381.82
machine hour
1b)
ski guard since its contribution margin per machine hour is much higher than the rest of the products
1c)
fishing guard since its contribution margin per machine hour is much lower than the rest of the products
2a)
Ski Golf Fishing
Guard Guard Guard
contribution margin per $11.67 $21.43 $6.36
lbs. of pellets
2b)
Golf guard since its contribution margin per lb. of pellets is much higher than the rest of the products
2c)
fishing guard since its contribution margin per lb. of pellets is much lower than the rest of the products
3)
Golf Guard ($150)
In particular, Article 2 of the Uniform Commercial Code creates warranties of merchantability, fitness for a particular purpose, and non-infringement in contracts for the sale of goods. [1] These implied warranties significantly expand the seller's exposure for potential liabilities to the buyer.