This concept isn’t new—in fact, it is the essence of representational state transfer (REST). Instead of converting to a ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. A static budget remains unchanged regardless of fluctuations in sales or production volumes.

Daniel Liberto is a journalist with over 10 years of experience working with publications such as the Financial Times, The Independent, and Investors Chronicle. Robert Kelly is managing director of ...