The immensity of mega-corporations is hard for the average person to fathom, for instance, the biggest corporation by sheer sales size is Walmart, with fiscal year 2016 sales of $482.1 billion dollars, an amount that is absolutely staggering, in addition to the fact that Walmart employs about 2.3 million people, easily making them the largest privately-held employer of people in America, and second in employment only to the military.
Further to the point, sales of $482 billion dollars are so huge, that if Walmart was just its own country, its GDP would rank just behind Sweden, and ahead of Belgium, to wit, Sweden's GDP is 23rd highest in the world, signifying that Walmart sales are greater than every other country beneath Sweden, or over 80% of the world's countries in total. All of this, doesn't necessarily mean that great size equates to great evil, but indicates that corporations that have massive sales and massive footprints around the globe, have inordinate amounts of influence upon people, countries, and governance, of which, Walmart is not a democratically elected representative in any government in any part of the world, yet, they hold powerful sway, in getting their way.
Size in all of its many manifestations, equates to power, such as the power to get roadway right-of-way and set asides, tax reductions and set asides, favorable infrastructure decisions, favorable laws, kickbacks or rebates of all sorts, pricing power over vendors and suppliers, and the list continues on and on. This would indicate for a certainty that the playing field that mega-corporations are on is materially different than those that may have equally or better ideas, but are overshadowed nearly completely by lack of size, and connections to those that make and have influence.
While there certainly are advantages to consumers in buying items from large corporations, such as the pricing and breadth of items often being very competitive and extensive, in-stock, and of great value, there are tradeoffs to these benefits, which is, for instance, that local communities rather than being in a situation in which the money cycles and recycles within that community, find more often than not, that a percentage of the money circulating is essentially being siphoned off to corporations which have their headquarters in different cities, or even different countries, so that the necessary infrastructure that cities need to grow and to benefit its constituents is reduced, forcing either a reduction in services or a need for more federal or governmental assistance of various kinds.
Also, it doesn't seem right that the very biggest corporations in the world get the very best deals in the sense of their cost of money, their tax structure, their tax benefits, their land deals, and just their overall benefits, in a situation in which, these large corporations have already more than enough to take care of business in an equitable and even-handed manner. The main reason why big corporations continue to throw their weight around is that they have an obligation to their stockholders and investors to always increase sales as well as to increase gross margins, and conversely to reduce expenses, so as to please those investors. This means, that big corporations, again and again, exert pressure to get what is best for them, never once taking their foot off of the pedal, in consideration that being a good neighbor is the best policy of all.