"Most of the money we're investing as part of this plan will get out the door immediately and go directly to job-creation, generating or saving three to four million new jobs. And the vast majority of these jobs will be created in the private sector—because, as theses CEOs well know, business, not government, is the engine of growth in this country. But even as this plan puts Americans back to work today, it will also make those critical investments in alternative energy and safer roads, better health care and modern schools that will lay the foundation for long-term growth and prosperity. And it will invest in broadband and emerging technologies ... because that is how America will retain and regain its competitive edge in the 21st century." Read the quotation above, an excerpt from a speech by a U. S. public official. The statement most directly reflects which of the following economic principles and contradicts which other?