FT Edit: Access on iOS and web
The universal cover of the double doughnut is a hyperbolic space。PDF资料是该领域的重要参考
Фото: Дмитрий Феоктистов / ТАСС，更多细节参见纸飞机下载
Declining small business confidence and performance is a bad omen for the economy at large. Small businesses have historically acted as a bellwether for the U.S. economy. Because smaller firms have less flexibility to navigate economic turbulence, noises in small business circles can anticipate shocks to the wider economy. Historically, declines in small business earnings and optimism can sometimes precede economic cooling or even recessions.