Google introduced which of the following changes to its search algorithm in 2011 to weed out low quality sites from search results?
A) Penguin
B) Hummingbird
C) Panda
D) Knowledge Graph
Question 2
Which of the following is not true regarding e-commerce today?
A) Economists' visions of a friction-free market have not been realized.
B) Consumers are less price-sensitive than expected.
C) There remains considerable persistent price dispersion.
D) The market middlemen disappeared.