Which circumstance was most directly responsible for the rapid growth of the railroad industry? inventors developed air brakes and more efficient train-car connectors builders agreed on a universal width for train tracks railroad owners sold stock to investors to finance the construction of railroads pullman began manufacturing cars for overnight travel

Railroad owners sold stock to investors to finance the construction of railroads

Constructing railways was and still is a very expensive capital intensive business. Not only did it require large gangs of workers but the land had to be bought and the tracks themselves also had to be laid. To do that the rail companies sold shares to investors and raised the money.

answer: a

explanation:  

stocks and bonds are the two main classes of assets investors use in their portfolios. stocks offer an ownership stake in a company, while bonds are akin to loans made to a company (a corporate bond) or other organization (like the u.s. treasury). in general, stocks are considered riskier and more volatile than bonds.

savings accounts are just money in a bank- they are insured by the fdic for up to 250,000.   very little risk

the average mutual fund holds hundreds of different securities, which means mutual fund shareholders gain important diversification at a low price. which means if one stock or bond drops it will have very little affect on the mutual fund - again very little risk