What is marginal ecosystem?
In regards to marginal vs. non-marginal syndesmophytes. Marginal syndesmophytes (intervertebral bony bony bridges) are more commonly seen in ankylosing spondylitis. Where as non-marginal syndesmophytes are more commonly in reactive arthritis and DISH. Marginal syndesmophytes are delicate + symmetric; while non-marginal syndesmophytes are bulky + discontinuous.
Economic theory makes much use of marginal concepts. Marginal cost, marginal revenue, marginal rate of substitution, marginal utility, marginal product, and marginal propensity to consume are a few examples. Marginal means on the margin and refers to what happens with a small change from the present position. It is the concept of economic choices to make small changes rather than large-scale adjustments. Marginal analysis is the key principle of profit-maximization in firms and utility maximization…