Consider goods market interaction as an example: if the OCA criteria were applied before the currency union forms, then many countries might exhibit low trade volumes and low market integration; which means that OCA criteria are not met. Thus, the currency union might not be formed based on those current characteristics. However, if the currency union was established anyway, its member-states would trade so much more that, in the end, the OCA criteria would be met. This logic suggests that the OCA criteria can be self-fulfilling. Furthermore, greater integration under the OCA project might also improve other OCA criteria. For example, if goods markets are better connected, shocks will be more rapidly transmitted within the OCA and will be felt more symmetrically.