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In this paper we analyze the historical returns of the companies listed on the Colombian stock exchange, from January 2004 until June 2012, in order to determine the possible presence of a risk premium in smaller companies relative to larger ones. This premium is known as Size Effect and it has been found that it is significant after adjusting of risk by Capital Asset Pricing Model. The results obtained in this work for the stock market in Colombia do not show the presence of an additional risk premium due to the size of enterprises, rejecting both size effect and reverse size effect. [ABSTRACT FROM AUTHOR]

We use information from surveys of economic expectations to see if the effect of monetary policy differs between large and small companies. The methodology used is vector autoregressions with regime change, MS-BVAR. According to the impulse response functions, to a shock in interest rates, the business climate both large and small companies regime responds positively during expansions, while during contraction responses are negative and more pronounced. The results suggest that larger firms are more sensitive to interest rate shocks. This is probably due to the low level of financial deepening. [ABSTRACT FROM AUTHOR]