Since World War II, aircraft carrier designs have increased in size to accommodate a steady increase in aircraft size. The large, modern Nimitz class of US carriers has a displacement nearly four times that of the World War IIera USS Enterprise, yet its complement of aircraft is roughly the samea consequence of the steadily increasing size and weight of military aircraft over the years. Today's aircraft carriers are so expensive that nations which operate them risk significant political, economic, and military impact if a carrier is lost, or even used in conflict.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Today's aircraft carriers are so cheap that nations which operate them risk what?
Ah, so.. unanswerable

When World War II started, tonnage levels at the port decreased and shipping activities were suspended; however, the war did provide economic benefits for the city. Petrochemical refineries and manufacturing plants were constructed along the ship channel because of the demand for petroleum and synthetic rubber products by the defense industry during the war. Ellington Field, initially built during World War I, was revitalized as an advanced training center for bombardiers and navigators. The Brown Shipbuilding Company was founded in 1942 to build ships for the U.S. Navy during World War II. Due to the boom in defense jobs, thousands of new workers migrated to the city, both blacks and whites competing for the higher-paying jobs. President Roosevelt had established a policy of non-discrimination for defense contractors, and blacks gained some opportunities, especially in shipbuilding, although not without resistance from whites and increasing social tensions that erupted into occasional violence. Economic gains of blacks who entered defense industries continued in the postwar years.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What world event caused this increased need for petrochemicals?
Ah, so.. World War II

London is the world's most expensive office market for the last three years according to world property journal (2015) report. As of 2015[update] the residential property in London is worth $2.2 trillion - same value as that of Brazil annual GDP. The city has the highest property prices of any European city according to the Office for National Statistics and the European Office of Statistics. On average the price per square metre in central London is 24,252 (April 2014). This is higher than the property prices in other G8 European capital cities; Berlin 3,306, Rome 6,188 and Paris 11,229.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What is the average property price per square meter in Berlin as of April 2014?
Ah, so..
3,306