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They argue that Rome's expansion was driven by short-term defensive and inter-state factors (that is, relations with city-states and kingdoms outside Rome's hegemony), and the new contingencies that these decisions created.
What factor is considered by some to be the main driving force behind the expansion of Rome?

answer: yes

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Several scholars have argued that a lack of transparency about banks' risk exposures prevented markets from correctly pricing risk before the crisis, enabled the mortgage market to grow larger than it otherwise would have, and made the financial crisis far more disruptive than it would have been if risk levels had been disclosed in a straightforward, readily understandable format.
According to several scholars, what prevented markets from correctly pricing risk before the crisis?

answer: yes

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By mid-2014, Accelerator, a biotech investment firm, had raised more than US$30 million from investors, including Eli Lilly and Company, Pfizer, and Johnson & Johnson, for initial funding to create biotechnology startups at the Alexandria Center for Life Science, which encompasses more than 700,000 square feet (65,000 m2) on East 29th Street and promotes collaboration among scientists and entrepreneurs at the center and with nearby academic, medical, and research institutions.
About how much capital did Accelerator raise as of the middle of 2014?

answer: yes

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In 944 the Rus' force advanced again on the Greeks, by land and sea, and a Byzantine force from Cherson responded.
When did the Rus return to Byzatine seeking revenge?

answer:
yes