In developed economies, medium sized firms make up roughly half of all economic growth and employment. Among poor economies however, these firms are virtually absent, as is financing for the creation of them, despite the rise of innovative microfinance institutions. This phenomenon is termed the “missing middle”. My paper sought to understand how firms of this size were established in the developed world, by juxtaposing the financial ecosystem of Industrial Revolution era Scotland to those of developing countries today. I choose Scotland because of its’ rapid development during the 18th and 19th centuries, despite relative poverty and lack of infrastructure compared to contemporary western European countries. I studied primary sources such as accounting documents, and letters between firm owners and managers to develop a picture of the business strategies and financial products used by these firms. These historical strategies were compared to those employed by modern microfinance institutions such as Grameen, based on their published financial statements. Similarities abounded: schemes where individuals pool their savings to create loanable capital, easy loan terms, co-signing, and other practices. The differences however, are stark. Scottish banks lent small and medium sized debts, and rarely had more than a few hundred, local accounts. Modern microfinance institutions service millions of tiny borrowers. Additionally, Scottish banks were universally general-partnerships, a form mostly extinct today. I conclude by suggesting that these differences were key in allowing Scottish banks to finance the Industrial Revolution in Scotland, and that they could assist in financing the “missing middle” in the developing world today.