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This study aims to intend to investigate the dynamic causality and asymmetric relationships between corruption and economic growth of Nigeria.

Toda–Yamamoto (TY) Dynamic Causality Test and Non-linear Autoregressive Distributed Lag Model (NARDL) were used for the estimations, for the period 1984–2018.

The result reveals the existence of bidirectional causality between control of corruption and economic growth, Similarly, in both the short run and long run, corruption can affect economic growth and economic growth can as well affects corruption.

Findings of the research are limited to Nigeria whose data were used, based on TY causality test and NARDL as the econometrics techniques applied, for a period 1984–2018.

For a meaningful progress to be recorded in Nigeria in terms of economic growth, the country must device some means for strengthen the control of corruption.

The study was able to prove empirically, the existence of not only causality between corruption and economic growth but also asymmetric effect of corruption on economic growth and that of economic growth on corruption in both the long run and short run, as against the previous studies that are lopsided on the effect of corruption on economic growth only.

The problem of inaccessibility of finance for farm investment is a common phenomenon among farmers, especially the rural dwellers. Thus, there is a need to know how the accessibility of informal finance can be increased to increase farm investment. Therefore, this study evaluates farmers’ access to informal finance and its contribution to farm investment among rural farmers in Northcentral Nigeria.

A three-stage random sampling technique was employed to select 160 farmers. Primary data collected were analysed with descriptive statistics and the Heckman selection model.

The study revealed that cooperative society is the major informal means of loan acquisition used by the farmers followed by Rotational Savings and Credit Associations (RoSCAs). Informal loans contributed to agricultural investment through the various operational activities involved in production. Factors influencing farmers’ access to informal loans were the age, farm size and income of the farmers. Interest charged, farmers' age, farming experience, household size, education and loan duration were the drivers of the amount borrowed from the informal financing sector.

The findings of the study call for policies that will sustain informal financial institutions in developing economies, like Nigeria. Thus, the government through its regulatory agencies should assist informal finance providers with the necessary resources to achieve more goals. This is because the informal credit lenders help in bridging financial gaps created by formal financial institutions, such as commercial banks.

Unlike the previous research studies, this study investigated the driving factors of the amount borrowed from informal finance and its use in farm investment.