Corruption, in the form of bribery, extortion, embezzlement and clientelism, is prevalent among developing countries. It can be a tremendous cost for firms to do business, as evidenced by the strong negative correlation between corruption and the ease of doing business in a country (Figure 1). For an average firm in developing countries, the cost of corruption is expected to become more significant when it grows larger in size (Figure 2). How do firms get around the corruption barrier as they grow?A firm may incur corrupt practices at all stages, including registration, production and market sales. Although most research focuses on corruption at the registration or production stages, corruption related to market sales is also prevalent in practice. Examples include embezzlement during transport, corrupt court systems and local clientelism blocking firm entry. If corruption increases the cost of domestic sales and more so for firms that are larger in size, then exporting to foreign markets may become a more appealing option as they grow.To guide our study, we build a simple model to analyse the relationship between corruption and firms' exports. A firm decides on how to allocate its sales in domestic and foreign markets, taking into account the costs of corruption to access the domestic market. For simplicity, we assume it a bribe request (or extortion) that a firm needs to pay for domestic sales. When the expected cost for an official to extract bribes is fixed, the optimal strategy for the official is to target large firms and let go small firms. In response, large firms increase their exports and decrease their domestic sales to shelter Authors contribute equally to this paper.