Patronage concentration is a term used in marketing. It is the share of an individual consumer's expenditures in an industry that is spent at one company. It is the amount that a person spends at one company divided by the amount that person spends at all companies in the industry.
amount spent at one company ___________________________________ amount spent at all companies in the industry
The amount a person spends at one company is sometimes called the "relationship revenue".
For example, I may spend $1000 per year at fast food restaurants. If I spend $100 at Wendy's Restaurants, then Wendy's has (100/1000=10%) ten percent of my patronage. As long as the amount spent at one firm is less than the total amount spent at all firms in the industry, the customer will be patronizing more than one firm, and patronage concentration will be less than 100%.
The goal of many firms is to increase the patronage concentration ratio of its customers to 100% (that is make it an exclusive relationship). Some firms set different patronage concentration targets for various classes of customers. This reflects the fact that some types of customers are more profitable than others.
This is very similar to market share. Whereas market share describes the percentage of all customers that patronize a company relative to the industry total, the patronage concentration ratio describes the percentage of one customer's patronage going to a company, relative to that persons spend in the industry. That is, market share is the aggregate or macro version of the patronage concentration ratio. Or alternatively, patronage concentration is the micro equivalent of market share.
Roman patronage is a lot like the elephant in the story of the five blind men: it is big and warm and moving, its smell is everywhere.
The same comparison is true for Roman patronage: we know it is there, it looms large and even overpowering in the society we study and the literature we read, but we cannot easily relate the parts to the whole.
Concentration on the parasite permits such otherwise disparate characters as Ennius, Lucilius' Naevius, Martial's Selius and Martial himself, Cicero's Naevius from pro Quinctio, and Philodemus to be analyzed under the same rubric.
The concentration of urban properties in Cairo, the city founded by the Fatimids for themselves, is not surprising.
The extent of the executive powers concentrated in the hands of the civilian viziers, and their personal aaggrandizement aroused the suspicious of the imams who did not hesitate to oust and, occasionally, to kill their civilian viziers.
Examples of al-Yazuri's use of patronage are recorded by the historians of the period.
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