We use randomized grants to generate shocks to capital stock for a set of Sri Lankan microenterprises. We find the average real return to capital in these enterprises is 4.6%–5.3% per year), substantially higher than market interest rates. We then examine the heterogeneity of treatment effects. Returns are found to vary with entrepreneurial ability and with household wealth, but not to vary with measures of risk aversion or uncertainty. Treatment impacts are also significantly larger for enterprises owned by males; indeed, we find no positive return in enterprises owned by females.

We report on a field experiment using several methods for collecting deposits made in formal bank accounts in rural areas in Sri Lanka. We find that only frequent, face-to-face collection increases aggregate household savings. Collection involving community lock boxes increases balances at the collecting bank, but not overall household savings. Only community box collection appears to have the possibility of being financially viable. The various collection methods allow us to unbundle the role of frequency, salience and habit formation in deposit decisions. We find that frequency and salience affect the number of transactions, but not the level of savings.

We introduce a new mobile money interface that permits Sri Lankans to deposit mobile airtime balances directly into a formal bank account. Randomizing access and prices, we find a small increase in savings deposits with the partner institution and formal banks more generally, but no change in overall savings. When the deposit transaction costs are completely removed, only 26% use the mobile deposit service and only 7% use it frequently. Our results imply that deposit transaction costs are not a significant barrier to increasing savings, limiting the potential gains of mobile-linked savings products for financial inclusion.